A Review on Energy, Environmental, and Sustainability Implications of Connected and Automated Vehicles
- Morteza Taiebat
Morteza TaiebatSchool for Environment and Sustainability, University of Michigan, Ann Arbor, Michigan 48109, United StatesDepartment of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan 48109, United StatesMore by Morteza Taiebat
- ,
- Austin L. Brown
Austin L. BrownPolicy Institute for Energy, Environment, and the Economy, University of California, Davis, California 95616, United StatesMore by Austin L. Brown
- ,
- Hannah R. Safford
Hannah R. SaffordDepartment of Civil & Environmental Engineering, University of California, Davis, California 95616, United StatesMore by Hannah R. Safford
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- Shen Qu
Shen QuSchool for Environment and Sustainability, University of Michigan, Ann Arbor, Michigan 48109, United StatesMore by Shen Qu
- , and
- Ming Xu*
Ming XuSchool for Environment and Sustainability, University of Michigan, Ann Arbor, Michigan 48109, United StatesDepartment of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan 48109, United StatesMore by Ming Xu
Abstract
Connected and automated vehicles (CAVs) are poised to reshape transportation and mobility by replacing humans as the driver and service provider. While the primary stated motivation for vehicle automation is to improve safety and convenience of road mobility, this transformation also provides a valuable opportunity to improve vehicle energy efficiency and reduce emissions in the transportation sector. Progress in vehicle efficiency and functionality, however, does not necessarily translate to net positive environmental outcomes. Here, we examine the interactions between CAV technology and the environment at four levels of increasing complexity: vehicle, transportation system, urban system, and society. We find that environmental impacts come from CAV-facilitated transformations at all four levels, rather than from CAV technology directly. We anticipate net positive environmental impacts at the vehicle, transportation system, and urban system levels, but expect greater vehicle utilization and shifts in travel patterns at the society level to offset some of these benefits. Focusing on the vehicle-level improvements associated with CAV technology is likely to yield excessively optimistic estimates of environmental benefits. Future research and policy efforts should strive to clarify the extent and possible synergetic effects from a systems level to envisage and address concerns regarding the short- and long-term sustainable adoption of CAV technology.
1. Introduction
2. Levels of Interactions between CAVs and the Environment
Major Influencing Mechanisms | Positive Impacts | Negative Impacts | Sources | |
---|---|---|---|---|
Vehicle | •vehicle operation | •higher energy efficiency | •faster highway speeds | (4,12−14,16−22) |
•vehicle design | •optimal driving cycle | •additional ICT equipment needs for navigation and communication | ||
•electrification | •eco-routing | •aerodynamic shape alteration | ||
•platooning | •reduce cold starts | •higher auxiliary power requirement | ||
•less idling | ||||
•less speed fluctuations | ||||
•powertrain downsizing | ||||
•self-parking | ||||
•safety-enabled vehicle light-weighting | ||||
•vehicle right-sizing | ||||
•complementary electrification benefits | ||||
•platooning | ||||
Transportation System | •travel-cost implications | •greatly reduced human labor costs | •higher vehicle utilization rate | (12−14,16,17,19,23−32) |
•changed mobility services | •promotion of shared mobility | •more frequent and longer trips result in greater VMT | ||
•vehicle utilization | •integration with mass transit | •more unoccupied travel (for parking, between trips, etc.) | ||
•congestion and road capacity | •fleet downsizing | •congestion increases due to induced travel | ||
•increased effective roadway capacity | •competition with mass transit | |||
•decongestion | ||||
•fewer crashes and less accident-related traffic | ||||
•syncing with traffic lights | ||||
Urban System | •infrastructure implications | •changes in land-use patterns | •increased urban sprawl | (14,24,33−36) |
•integration of CAVs with power systems | •reduced need for parking infrastructure | •need for large, energy-intensive data centers | ||
•land use | •integration with power systems through vehicle electrification | |||
•reduced need for highway lighting and traffic signals | ||||
Society | •behavior response and travel pattern shift | •promotion of shared consumption | •induced travel demand and rebound effect | (16,17,25,37−42) |
•shared consumption | •spillover effects to other sectors | •transportation modal shift (e.g., rail/aviation to road travel) | ||
•transformation of other sectors | •gradual unemployment and job displacement | |||
•workforce impacts |
Studya | Vehicle | Transp. sys. | Urban sys. | Society |
---|---|---|---|---|
Alonso-Mora et al. (24) b | √ | |||
Anderson et al. (6) | √ | √ | √ | √ |
Auld et al. (25) b | √ | |||
Bansal and Kockelman (38) b | √ | |||
Barth et al. (19) | √ | √ | ||
Bauer et al. (43) b | √ | √ | ||
Brown et al. (14) | √ | √ | √ | √ |
Chen et al. (31) b | √ | √ | ||
Chen et al. (44) b | √ | |||
Childress et al. (17) b | √ | √ | √ | |
Crayton and Meier (45) b | √ | |||
Fagnant and Kockelman (29) b | √ | √ | ||
Fox-Penner et al. (46) b | √ | |||
Fulton et al. (47) | √ | √ | ||
Gawron et al. (48) b | √ | |||
Gonder et al. (49) b | √ | |||
Greenblat and Shaheen (32) | √ | √ | √ | √ |
Greenblatt and Saxena (13) b | √ | √ | √ | |
Harper et al. (40) b | √ | |||
Heard et al. (50) b | √ | |||
Kang et al. (23) b | √ | √ | √ | |
Kolosz and Grant-Muller (35) b | √ | √ | ||
König and Neumayr (51) b | √ | |||
Kyriakidis et al. (41) b | √ | |||
Lavrenz and Gkritza (52) b | √ | √ | ||
Li et al. (36) b | √ | √ | ||
Liu et al. (53) | √ | |||
Lu et al. (26) b | √ | √ | ||
Malikopoulos et al. (54)b | √ | √ | ||
Mersky and Samaras (18) b | √ | |||
Moorthy et al. (55) b | √ | |||
Prakash et al. (56) | √ | |||
Rios-Torres and Malikopoulos (20) | √ | √ | ||
Stephens et al. (16) | √ | √ | √ | √ |
Stern et al. (28) b | √ | |||
Wadud (57) b | √ | √ | ||
Wadud et al. (12) b | √ | √ | √ | √ |
Wang et al. (58) b | √ | |||
Wu et al. (59) b | √ | |||
Zakharenko (60) b | √ | √ | ||
Zhang et al. (61) b | √ | |||
Zhang et al. (62) b | √ |
Sorted alphabetically based on first author.
Publication in a peer-reviewed journal.
3. Environmental Impacts of CAV at Each System Level
3.1. Vehicle Level
3.1.1. Vehicle Operation
3.1.2. Electrification
3.1.3. Vehicle Design
3.1.3.a. Vehicle Light-Weighting
3.1.3.b. Vehicle Right-Sizing
3.1.3.c. ICT Equipment and Aerodynamic Shape Alteration
3.1.4. Platooning
3.2. Transportation System Level
3.2.1. Travel-Cost Implications
3.2.2. Changed Mobility Services
3.2.2.a. Shared Mobility
3.2.2.b. Interaction with Mass Transit
3.2.3. Vehicle Utilization
3.2.4. Congestion and Road Capacity
3.3. Urban System Level
3.3.1. Infrastructure Implications
3.3.1.a. Existing Infrastructure (Lighting and Traffic Signals)
3.3.1.b. New Infrastructure Requirements
3.3.2. Integration of CAVs with Power Systems
3.3.3. Land Use
3.4. Society Level
3.4.1. Behavioral Response and Travel Pattern Shift
3.4.2. Shared Consumption
3.4.3. Transformation of Other Sectors
3.4.4. Workforce Impacts
3.5. Summary of Environmental Impacts of CAVs
4. Priority research needs
I. | Where possible, transition to empirical, data-based analysis of CAV impacts and revisit assumptions. The novelty of CAV technology and lack of data means that analysis of CAV impacts has, to date, been largely speculative and qualitative. Moreover, many analyses are based on oversimplified or unrealistic assumptions. Researchers should strive to increase the rigor of CAV studies as more data and higher fidelity models become available. |
||||
II. | Improve models by more accurately characterizing CAV impacts and better capturing uncertainty. Most analyses have assumed the mechanisms by which CAVs impact the environment are independent of one another. This assumption frequently leads to underestimation or overestimation of aggregate impacts. Furthermore, models should better reflect the true nature of CAV impacts. For instance, many studies fail to distinguish between general trends of energy efficiency improvement in vehicles and additional benefits that are solely enabled by CAV attributes. It is also necessary to quantify the upper and lower bounds of impacts and incorporate these bounds into models to better capture and characterize uncertainty. |
||||
III. | Place more effort on understanding the effects of different CAV technologies and market scenarios on consumer behavior and travel patterns. Although improvements in CAV efficiency at the vehicle level should not be overlooked, the largest environmental impacts are likely to depend on consumer behavior and travel patterns: that is, when, where, how often, and how much consumers travel with CAVs. |
||||
IV. | Integrate analysis and modeling across different system levels. There is a need for deeper investigation on how mechanisms at each level reinforce or undermine each other. Figure 3 illustrates interactions and linkages across the four system levels identified in this review that are likely to have substantial energy, environmental, and sustainability implications. The trade-offs between interactions and linkages are largely unexplored and merit further research. |
4.1. CAV Design and Testing
4.2. CAV-Specific Models and Tools
4.3. Behavioral Studies
4.4. Policy Needs and Opportunities
Supporting Information
The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.8b00127.
Short description of CAV components (PDF)
Terms & Conditions
Most electronic Supporting Information files are available without a subscription to ACS Web Editions. Such files may be downloaded by article for research use (if there is a public use license linked to the relevant article, that license may permit other uses). Permission may be obtained from ACS for other uses through requests via the RightsLink permission system: http://pubs.acs.org/page/copyright/permissions.html.
Acknowledgments
Authors thank several participants of the 2017 and 2018 Automated Vehicle Symposium (Energy and Environmental Implications of CAVs Breakout Sessions), as well as many other experts for providing helpful suggestions, insight, and feedback. The contribution of Dave Brenner for creating figures is appreciated. We also thank the anonymous reviewers, whose constructive comments substantially improved the paper.
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39Clark, B.; Parkhurst, G.; Ricci, M. Understanding the Socioeconomic Adoption Scenarios for Autonomous Vehicles: A Literature Review; University of the West of England: Bristol, 2016.There is no corresponding record for this reference.
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40Harper, C. D.; Hendrickson, C. T.; Mangones, S.; Samaras, C. Estimating Potential Increases in Travel with Autonomous Vehicles for the Non-Driving, Elderly and People with Travel-Restrictive Medical Conditions. Transp. Res. Part C Emerg. Technol. 2016, 72, 1– 9, DOI: 10.1016/j.trc.2016.09.003There is no corresponding record for this reference.
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41Kyriakidis, M.; Happee, R.; de Winter, J. C. F. Public Opinion on Automated Driving: Results of an International Questionnaire among 5000 Respondents. Transp. Res. part F traffic Psychol. Behav 2015, 32, 127– 140, DOI: 10.1016/j.trf.2015.04.014There is no corresponding record for this reference.
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42Fagnant, D. J.; Kockelman, K. Preparing a Nation for Autonomous Vehicles: Opportunities, Barriers and Policy Recommendations. Transp. Res. Part A Policy Pract. 2015, 77, 167– 181, DOI: 10.1016/j.tra.2015.04.003There is no corresponding record for this reference.
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43Bauer, G. S.; Greenblatt, J. B.; Gerke, B. F. Cost, Energy, and Environmental Impact of Automated Electric Taxi Fleets in Manhattan. Environ. Sci. Technol. 2018, 52 (8), 4920– 4928, DOI: 10.1021/acs.est.7b04732There is no corresponding record for this reference.
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44Chen, Y.; Gonder, J.; Young, S.; Wood, E. Quantifying Autonomous Vehicles National Fuel Consumption Impacts: A Data-Rich Approach. Transp. Res. Part A Policy Pract. 2017, DOI: 10.1016/j.tra.2017.10.012There is no corresponding record for this reference.
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45Crayton, T. J.; Meier, B. M. Autonomous Vehicles: Developing a Public Health Research Agenda to Frame the Future of Transportation Policy. J. Transp. Heal. 2017, 6, 245– 252, DOI: 10.1016/j.jth.2017.04.004There is no corresponding record for this reference.
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46Fox-Penner, P.; Gorman, W.; Hatch, J. Long-Term U.S Transportation Electricity Use Considering the Effect of Autonomous-Vehicles: Estimates & Policy Observations. Energy Policy 2018, 122, 203– 213, DOI: 10.1016/j.enpol.2018.07.033There is no corresponding record for this reference.
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47Fulton, L.; Mason, J.; Meroux, D. Three Revolutions in Urban Transportation: How to Achieve the Full Potential of Vehicle Electrification, Automation and Shared Mobility in Urban Transportation Systems around the World by 2050; Institute for Transportation and Development Policy, 2017.There is no corresponding record for this reference.
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48Gawron, J. H.; Keoleian, G. A.; De Kleine, R. D.; Wallington, T. J.; Kim, H. C. Life Cycle Assessment of Connected and Automated Vehicles: Sensing and Computing Subsystem and Vehicle Level Effects. Environ. Sci. Technol. 2018, 52 (5), 3249– 3256, DOI: 10.1021/acs.est.7b0457648https://chemport.cas.org/services/resolver?origin=ACS&resolution=options&coi=1%3ACAS%3A528%3ADC%252BC1cXis1yiu78%253D&md5=be8d9eacb354129ba8f5808bc9b63e78Life Cycle Assessment of Connected and Automated Vehicles: Sensing and Computing Subsystem and Vehicle Level EffectsGawron, James H.; Keoleian, Gregory A.; De Kleine, Robert D.; Wallington, Timothy J.; Kim, Hyung ChulEnvironmental Science & Technology (2018), 52 (5), 3249-3256CODEN: ESTHAG; ISSN:0013-936X. (American Chemical Society)Although recent studies of connected and automated vehicles (CAVs) have begun to explore the potential energy and greenhouse gas (GHG) emission impacts from an operational perspective, little is known about how the full life cycle of the vehicle will be impacted. We report the results of a life cycle assessment (LCA) of Level 4 CAV sensing and computing subsystems integrated into internal combustion engine vehicle (ICEV) and battery elec. vehicle (BEV) platforms. The results indicate that CAV subsystems could increase vehicle primary energy use and GHG emissions by 3-20% due to increases in power consumption, wt., drag, and data transmission. However, when potential operational effects of CAVs are included (e.g., eco-driving, platooning, and intersection connectivity), the net result is up to a 9% redn. in energy and GHG emissions in the base case. Overall, this study highlights opportunities where CAVs can improve net energy and environmental performance.
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49Gonder, J.; Wood, E.; Rajagopalan, S. Connectivity-Enhanced Route Selection and Adaptive Control for the Chevrolet Volt. J. Traffic Transp. Eng. 2016, 4 (1), 49– 60, DOI: 10.17265/2328-2142/2016.01.006There is no corresponding record for this reference.
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50Heard, B. R.; Taiebat, M.; Xu, M.; Miller, S. A. Sustainability Implications of Connected and Autonomous Vehicles for the Food Supply Chain. Resour. Conserv. Recycl. 2018, 128, 22– 24, DOI: 10.1016/j.resconrec.2017.09.021There is no corresponding record for this reference.
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51König, M.; Neumayr, L. Users’ Resistance towards Radical Innovations: The Case of the Self-Driving Car. Transp. Res. Part F Traffic Psychol. Behav. 2017, 44, 42, DOI: 10.1016/j.trf.2016.10.013There is no corresponding record for this reference.
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52Lavrenz, S.; Gkritza, K. Environmental and Energy Impacts of Automated Electric Highway Systems. J. Intell. Transp. Syst. 2013, 17 (3), 221– 232, DOI: 10.1080/15472450.2012.716651There is no corresponding record for this reference.
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53Liu, J.; Kockelman, K. M.; Nichols, A. Anticipating the Emissions Impacts of Smoother Driving by Connected and Autonomous Vehicles, Using the MOVES Model. In Smart Transport for Cities & Nations: The Rise of Self-Driving & Connected Vehicles ; 2018.There is no corresponding record for this reference.
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54Malikopoulos, A. A.; Cassandras, C. G.; Zhang, Y. J. A Decentralized Energy-Optimal Control Framework for Connected Automated Vehicles at Signal-Free Intersections. Automatica 2018, 93, 244– 256, DOI: 10.1016/j.automatica.2018.03.056There is no corresponding record for this reference.
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55Moorthy, A.; De Kleine, R.; Keoleian, G.; Good, J.; Lewis, G. Shared Autonomous Vehicles as a Sustainable Solution to the Last Mile Problem: A Case Study of Ann Arbor-Detroit Area. SAE Int. J. Passeng. Cars - Electron. Electr. Syst. 2017, 10 (2), 328– 336, DOI: 10.4271/2017-01-1276There is no corresponding record for this reference.
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56Prakash, N.; Cimini, G.; Stefanopoulou, A. G.; Brusstar, M. J. Assessing Fuel Economy From Automated Driving: Influence of Preview and Velocity Constraints. In Proceedings of the ASME 2016 Dynamic Systems and Control Conference DSCC2016; ASME, 2016. DOI: 10.1115/DSCC2016-9780 .There is no corresponding record for this reference.
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57Wadud, Z. Fully Automated Vehicles: A Cost of Ownership Analysis to Inform Early Adoption. Transp. Res. Part A Policy Pract. 2017, 101, 163– 176, DOI: 10.1016/j.tra.2017.05.005There is no corresponding record for this reference.
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58Wang, Z.; Chen, X. M.; Ouyang, Y.; Li, M. Emission Mitigation via Longitudinal Control of Intelligent Vehicles in a Congested Platoon. Comput. Civ. Infrastruct. Eng. 2015, 30 (6), 490– 506, DOI: 10.1111/mice.12130There is no corresponding record for this reference.
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59Wu, G.; Boriboonsomsin, K.; Xia, H.; Barth, M. Supplementary Benefits from Partial Vehicle Automation in an Ecoapproach and Departure Application at Signalized Intersections. Transp. Res. Rec. 2014, 2424, 66– 75, DOI: 10.3141/2424-08There is no corresponding record for this reference.
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60Zakharenko, R. Self-Driving Cars Will Change Cities. Reg. Sci. Urban Econ 2016, 61, 26– 37, DOI: 10.1016/j.regsciurbeco.2016.09.003There is no corresponding record for this reference.
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61Zhang, W.; Guhathakurta, S.; Fang, J.; Zhang, G. Exploring the Impact of Shared Autonomous Vehicles on Urban Parking Demand: An Agent-Based Simulation Approach. Sustain. Cities Soc. 2015, 19, 34– 45, DOI: 10.1016/j.scs.2015.07.006There is no corresponding record for this reference.
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62Zhang, W.; Guhathakurta, S.; Khalil, E. B. The Impact of Private Autonomous Vehicles on Vehicle Ownership and Unoccupied VMT Generation. Transp. Res. Part C Emerg. Technol. 2018, 90, 156– 165, DOI: 10.1016/j.trc.2018.03.005There is no corresponding record for this reference.
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63Barth, M.; Boriboonsomsin, K.; Wu, G. The Potential Role of Vehicle Automation in Reducing Traffic-Related Energy and Emissions. 2013 International Conference on Connected Vehicles and Expo (ICCVE) 2013, 604– 605, DOI: 10.1109/ICCVE.2013.6799862There is no corresponding record for this reference.
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64Hendrickson, C.; Biehler, A.; Mashayekh, Y. Connected and Autonomous Vehicles 2040 Vision; Carnegie Mellon University (CMU) report to Pennsylvania Department of Transportation (PennDOT), FHWA-PA-2014-004-CMU WO 1; Department of Transportation, Commonwealth of Pennsylvania: Harrisburg, PA, 2014.There is no corresponding record for this reference.
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65Thomas, J.; Hwang, H.-L.; West, B.; Huff, S. Predicting Light-Duty Vehicle Fuel Economy as a Function of Highway Speed. SAE Int. J. Passeng. Cars - Mech. Syst. 2013, 6 (2), 859– 875, DOI: 10.4271/2013-01-1113There is no corresponding record for this reference.
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66Delucchi, M. A.; Yang, C.; Burke, A. F.; Ogden, J. M.; Kurani, K.; Kessler, J.; Sperling, D. An Assessment of Electric Vehicles: Technology, Infrastructure Requirements, Greenhouse-Gas Emissions, Petroleum Use, Material Use, Lifetime Cost, Consumer Acceptance and Policy Initiatives. Philos. Trans. R. Soc., A 2014, 372, 20120325, DOI: 10.1098/rsta.2012.0325There is no corresponding record for this reference.
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67Michalek, J. J.; Chester, M.; Jaramillo, P.; Samaras, C.; Shiau, C.-S. N.; Lave, L. B. Valuation of Plug-in Vehicle Life-Cycle Air Emissions and Oil Displacement Benefits. Proc. Natl. Acad. Sci. U. S. A. 2011, 108 (40), 16554– 16558, DOI: 10.1073/pnas.110447310867https://chemport.cas.org/services/resolver?origin=ACS&resolution=options&coi=1%3ACAS%3A528%3ADC%252BC3MXhtlWksrvL&md5=2fa0ec64a1682462643fa8341e490f5fValuation of plug-in vehicle life-cycle air emissions and oil displacement benefitsMichalek, Jeremy J.; Chester, Mikhail; Jaramillo, Paulina; Samaras, Constantine; Shiau, Ching-Shin Norman; Lave, Lester B.Proceedings of the National Academy of Sciences of the United States of America (2011), 108 (40), 16554-16558, S16554/1-S16554/30CODEN: PNASA6; ISSN:0027-8424. (National Academy of Sciences)We assess the economic value of life-cycle air emissions and oil consumption from conventional vehicles, hybrid-elec. vehicles (HEVs), plug-in hybrid-elec. vehicles (PHEVs), and battery elec. vehicles in the US. We find that plug-in vehicles may reduce or increase externality costs relative to grid-independent HEVs, depending largely on greenhouse gas and SO2 emissions produced during vehicle charging and battery manufg. However, even if future marginal damages from emissions of battery and electricity prodn. drop dramatically, the damage redn. potential of plug-in vehicles remains small compared to ownership cost. As such, to offer a socially efficient approach to emissions and oil consumption redn., lifetime cost of plug-in vehicles must be competitive with HEVs. Current subsidies intended to encourage sales of plug-in vehicles with large capacity battery packs exceed our externality ests. considerably, and taxes that optimally correct for externality damages would not close the gap in ownership cost. In contrast, HEVs and PHEVs with small battery packs reduce externality damages at low (or no) addnl. cost over their lifetime. Although large battery packs allow vehicles to travel longer distances using electricity instead of gasoline, large packs are more expensive, heavier, and more emissions intensive to produce, with lower utilization factors, greater charging infrastructure requirements, and life-cycle implications that are more sensitive to uncertain, time-sensitive, and location-specific factors.' To reduce air emission and oil dependency impacts from passenger vehicles, strategies to promote adoption of HEVs and PHEVs with small battery packs offer more social benefits per dollar spent.
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68Offer, G. J.; Howey, D.; Contestabile, M.; Clague, R.; Brandon, N. P. Comparative Analysis of Battery Electric, Hydrogen Fuel Cell and Hybrid Vehicles in a Future Sustainable Road Transport System. Energy Policy 2010, 38 (1), 24– 29, DOI: 10.1016/j.enpol.2009.08.040There is no corresponding record for this reference.
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69Kim, H. C.; Wallington, T. J.; Sullivan, J. L.; Keoleian, G. A. Life Cycle Assessment of Vehicle Lightweighting: Novel Mathematical Methods to Estimate Use-Phase Fuel Consumption. Environ. Sci. Technol. 2015, 49 (16), 10209– 10216, DOI: 10.1021/acs.est.5b0165569https://chemport.cas.org/services/resolver?origin=ACS&resolution=options&coi=1%3ACAS%3A528%3ADC%252BC2MXhtFGmtbfE&md5=8310b401e1f6d999b2c90d3e6a992019Life Cycle Assessment of Vehicle Lightweighting: Novel Mathematical Methods to Estimate Use-Phase Fuel ConsumptionKim, Hyung Chul; Wallington, Timothy J.; Sullivan, John L.; Keoleian, Gregory A.Environmental Science & Technology (2015), 49 (16), 10209-10216CODEN: ESTHAG; ISSN:0013-936X. (American Chemical Society)Lightweighting is a key strategy to improve vehicle fuel economy. Assessing the life-cycle benefits of lightweighting requires a quant. description of the use-phase fuel consumption redn. assocd. with mass redn. We present novel methods of estg. mass-induced fuel consumption (MIF) and fuel redn. values (FRVs) from fuel economy and dynamometer test data in the U.S. Environmental Protection Agency (EPA) database. In the past, FRVs were measured using exptl. testing. We demonstrate that FRVs can be math. derived from coast down coeffs. in the EPA vehicle test database avoiding addnl. testing. MIF and FRVs calcd. for 83 different 2013 MY vehicles are in the ranges 0.22-0.43 and 0.15-0.26 L/(100 km 100 kg), resp., and increase to 0.27-0.53 L/(100 km 100 kg) with powertrain resizing to retain equiv. vehicle performance. We show how use-phase fuel consumption can be estd. using MIF and FRVs in life cycle assessments (LCAs) of vehicle lightweighting from total vehicle and vehicle component perspectives with, and without, powertrain resizing. The mass-induced fuel consumption model is illustrated by estg. lifecycle greenhouse gas (GHG) emission benefits from lightweighting a grille opening reinforcement component using magnesium or carbon fiber composite for 83 different vehicle models.
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70U.S. Department of Transportation, Federal Highway Administration. National Household Travel Survey (NHTS), 2017. http://nhts.ornl.gov.There is no corresponding record for this reference.
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71Williams, E. Environmental Effects of Information and Communications Technologies. Nature 2011, 479 (7373), 354– 358, DOI: 10.1038/nature10682There is no corresponding record for this reference.
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72Chen, Y.; Meier, A. Fuel Consumption Impacts of Auto Roof Racks. Energy Policy 2016, 92, 325– 333, DOI: 10.1016/j.enpol.2016.02.031There is no corresponding record for this reference.
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73Autonomous Vehicles Factsheet, Report No. CSS16-18; Center for Sustainable Systems, University of Michigan: Ann Arbor, MI, August 2017.There is no corresponding record for this reference.
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74Morrow, W. R.; Greenblatt, J. B.; Sturges, A.; Saxena, S.; Gopal, A.; Millstein, D.; Shah, N.; Gilmore, E. A. Key Factors Influencing Autonomous Vehicles’ Energy and Environmental Outcome. In Road Vehicle Automation; Springer International Publishing, 2014; pp 127– 135. DOI: 10.1007/978-3-319-05990-7_12 .There is no corresponding record for this reference.
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75Mitra, D.; Mazumdar, A. Pollution Control by Reduction of Drag on Cars and Buses through Platooning. Int. J. Environ. Pollut. 2007, 30 (1), 90– 96, DOI: 10.1504/IJEP.2007.014504There is no corresponding record for this reference.
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76Parent, M. Advanced Urban Transport: Automation Is on the Way. IEEE Intell. Syst. 2007, 22 (2), 9– 11, DOI: 10.1109/MIS.2007.20There is no corresponding record for this reference.
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77Lu, X.-Y.; Shladover, S. E. Automated Truck Platoon Control and Field Test. In Road Vehicle Automation; Road Vehicle Automation; Springer International Publishing, 2014; pp 247– 261. DOI: 10.1007/978-3-319-05990-7_21 .There is no corresponding record for this reference.
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78Tsugawa, S. Results and Issues of an Automated Truck Platoon within the Energy ITS Project. In 2014 IEEE Intelligent Vehicles Symposium Proceedings; IEEE, 2014; pp 642– 647.There is no corresponding record for this reference.
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79Schito, P.; Braghin, F. Numerical and Experimental Investigation on Vehicles in Platoon. SAE Int. J. Commer. Veh. 2012, 5, 63– 71, DOI: 10.4271/2012-01-0175There is no corresponding record for this reference.
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80Mahmassani, H. S. Autonomous Vehicles and Connected Vehicle Systems: Flow and Operations Considerations. Transp. Sci. 2016, 50 (4), 1140– 1162, DOI: 10.1287/trsc.2016.0712There is no corresponding record for this reference.
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81Clewlow, R. R.; Shankar Mishra, G. Disruptive Transportation: The Adoption, Utilization, and Impacts of Ride-Hailing in the United States, Research Report UCD-ITS-RR-17-07; Institute of Transportation Studies, University of California, Davis, 2017.There is no corresponding record for this reference.
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82UBS Investment Bank. How Disruptive Will a Mass Adoption of Robotaxis Be?, 28 September 2017. https://neo.ubs.com/shared/d1RIO9MkGM/ues83702.pdf.There is no corresponding record for this reference.
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83Bösch, P. M.; Becker, F.; Becker, H.; Axhausen, K. W. Cost-Based Analysis of Autonomous Mobility Services. Transp. Policy 2018, 64, 76– 91, DOI: 10.1016/j.tranpol.2017.09.005There is no corresponding record for this reference.
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84Masoud, N.; Jayakrishnan, R. Autonomous or Driver-Less Vehicles: Implementation Strategies and Operational Concerns. Transp. Res. Part E Logist. Transp. Rev. 2017, 108, 179– 194, DOI: 10.1016/j.tre.2017.10.011There is no corresponding record for this reference.
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85Santi, P.; Resta, G.; Szell, M.; Sobolevsky, S.; Strogatz, S. H.; Ratti, C. Quantifying the Benefits of Vehicle Pooling with Shareability Networks. Proc. Natl. Acad. Sci. U. S. A. 2014, 111 (37), 13290– 13294, DOI: 10.1073/pnas.1403657111There is no corresponding record for this reference.
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86Bösch, P. M.; Ciari, F. Agent-Based Simulation of Autonomous Cars. 2015 American Control Conference (ACC) 2015, 2588– 2592, DOI: 10.1109/ACC.2015.7171123There is no corresponding record for this reference.
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87Loeb, B.; Kockelman, K. M.; Liu, J. Shared Autonomous Electric Vehicle (SAEV) Operations across the Austin, Texas Network with Charging Infrastructure Decisions. Transp. Res. Part C Emerg. Technol. 2018, 89, 222– 233, DOI: 10.1016/j.trc.2018.01.019There is no corresponding record for this reference.
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88Fagnant, D. J.; Kockelman, K. M. Dynamic Ride-Sharing and Fleet Sizing for a System of Shared Autonomous Vehicles in Austin. Texas. Transportation (Amst). 2018, 45 (1), 143– 158, DOI: 10.1007/s11116-016-9729-zThere is no corresponding record for this reference.
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89Zhang, W.; Guhathakurta, S.; Fang, J.; Zhang, G. The Performance and Benefits of a Shared Autonomous Vehicles Based Dynamic Ridesharing System: An Agent-Based Simulation Approach. In Transportation Research Board 94th Annual Meeting ; 2015.There is no corresponding record for this reference.
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90Yap, M. D.; Correia, G.; van Arem, B. Preferences of Travellers for Using Automated Vehicles as Last Mile Public Transport of Multimodal Train Trips. Transp. Res. Part A Policy Pract. 2016, 94, 1– 16, DOI: 10.1016/j.tra.2016.09.003There is no corresponding record for this reference.
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91Miller, S. A.; Heard, B. R. The Environmental Impact of Autonomous Vehicles Depends on Adoption Patterns. Environ. Sci. Technol. 2016, 50, 6119– 6121, DOI: 10.1021/acs.est.6b0249091https://chemport.cas.org/services/resolver?origin=ACS&resolution=options&coi=1%3ACAS%3A528%3ADC%252BC28XpsFOgs70%253D&md5=361ddb1bd150dbb6b1022cd64e033626The Environmental Impact of Autonomous Vehicles Depends on Adoption PatternsMiller, Shelie A.; Heard, Brent R.Environmental Science & Technology (2016), 50 (12), 6119-6121CODEN: ESTHAG; ISSN:0013-936X. (American Chemical Society)Autonomous vehicles (AV) have the potential to transform the transportation system. Forces affecting the environmental impacts of large-scale AV adoption are identified to help det. necessary future research direction. It is too early to det. which of these forces will dominate the system and dictate whether AV adoption will result in net redns. or increases in greenhouse gas emissions. The environmental research community must develop a better understanding of the disruptive forces of AV to help develop a strategy to reduce transportation emissions. Particular emphasis is needed regarding how AV will be adopted and used, since these patterns may ultimately dictate AV environmental impacts. Without better integration of engineering, social science, and planning to model future adoption scenarios, important opportunities to steer markets toward sustainable outcomes will be lost.
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92Levin, M. W.; Kockelman, K. M.; Boyles, S. D.; Li, T. A General Framework for Modeling Shared Autonomous Vehicles with Dynamic Network-Loading and Dynamic Ride-Sharing Application. Comput. Environ. Urban Syst. 2017, 64, 373– 383, DOI: 10.1016/j.compenvurbsys.2017.04.006There is no corresponding record for this reference.
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93Litman, T. Generated Traffic and Induced Travel: Implications for Transport Planning; Victoria Transport Policy Institute, 2018.There is no corresponding record for this reference.
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94Noruzoliaee, M.; Zou, B.; Liu, Y. Roads in Transition: Integrated Modeling of a Manufacturer-Traveler-Infrastructure System in a Mixed Autonomous/Human Driving Environment. Transp. Res. Part C Emerg. Technol. 2018, 90, 307– 333, DOI: 10.1016/j.trc.2018.03.014There is no corresponding record for this reference.
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95Energy Information Administration (EIA). How much electricity is used for lighting in the United States? https://www.eia.gov/tools/faqs/faq.cfm?id=99&t=3.There is no corresponding record for this reference.
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96Ashe, M.; de Monasterio, M.; Gupta, M.; Pegors, M. 2010 US Lighting Market Characterization, Report to US Department of Energy; U.S. DOE, 2012.There is no corresponding record for this reference.
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97Boyce, P. R.; Fotios, S.; Richards, M. Road Lighting and Energy Saving. Light. Res. Technol. 2009, 41 (3), 245– 260, DOI: 10.1177/1477153509338887There is no corresponding record for this reference.
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98Chung, H. S. H.; Ho, N. M.; Hui, S. Y. R.; Mai, W. Z. Case Study of a Highly-Reliable Dimmable Road Lighting System with Intelligent Remote Control. In European Conference on Power Electronics and Applications; IEEE, 2005. DOI: 10.1109/EPE.2005.219632 .There is no corresponding record for this reference.
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99Bullough, J. D.; Rea, M. S. Intelligent Control of Roadway Lighting to Optimize Safety Benefits per Overall Costs. In 14th International IEEE Conference on Intelligent Transportation Systems (ITSC); IEEE, 2011; pp 968– 972.There is no corresponding record for this reference.
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100Horner, N. C.; Shehabi, A.; Azevedo, I. L. Known Unknowns: Indirect Energy Effects of Information and Communication Technology. Environ. Res. Lett. 2016, 11 (10), 103001, DOI: 10.1088/1748-9326/11/10/103001There is no corresponding record for this reference.
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101Koomey, J. G. Worldwide Electricity Used in Data Centers. Environ. Res. Lett. 2008, 3 (3), 034008, DOI: 10.1088/1748-9326/3/3/034008There is no corresponding record for this reference.
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102Alexander-Kearns, M.; Peterson, M.; Cassady, A. The Impact of Vehicle Automation on Carbon Emissions: Where Uncertainty Lies; Center for American Progress, 2016.There is no corresponding record for this reference.
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103Bi, Z.; Kan, T.; Mi, C. C.; Zhang, Y.; Zhao, Z.; Keoleian, G. A. A Review of Wireless Power Transfer for Electric Vehicles: Prospects to Enhance Sustainable Mobility. Appl. Energy 2016, 179, 413– 425, DOI: 10.1016/j.apenergy.2016.07.003There is no corresponding record for this reference.
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104Sovacool, B. K.; Noel, L.; Axsen, J.; Kempton, W. The Neglected Social Dimensions to a Vehicle-to-Grid (V2G) Transition: A Critical and Systematic Review. Environ. Res. Lett. 2017, 13 (1), 013001, DOI: 10.1088/1748-9326/aa9c6dThere is no corresponding record for this reference.
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105Nourinejad, M.; Bahrami, S.; Roorda, M. J. Designing Parking Facilities for Autonomous Vehicles. Transp. Res. Part B Methodol. 2018, 109, 110– 127, DOI: 10.1016/j.trb.2017.12.017There is no corresponding record for this reference.
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106Chester, M.; Horvath, A.; Madanat, S. Parking Infrastructure: Energy, Emissions, and Automobile Life-Cycle Environmental Accounting. Environ. Res. Lett. 2010, 5 (3), 034001, DOI: 10.1088/1748-9326/5/3/034001There is no corresponding record for this reference.
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107Bansal, P.; Kockelman, K. M.; Singh, A. Assessing Public Opinions of and Interest in New Vehicle Technologies: An Austin Perspective. Transp. Res. Part C Emerg. Technol. 2016, 67, 1– 14, DOI: 10.1016/j.trc.2016.01.019There is no corresponding record for this reference.
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108Borenstein, S. A Microeconomic Framework for Evaluating Energy Efficiency 2013, w19044, DOI: 10.3386/w19044There is no corresponding record for this reference.
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109Gillingham, K.; Kotchen, M. J.; Rapson, D. S.; Wagner, G. Energy Policy: The Rebound Effect Is Overplayed. Nature 2013, 493 (7433), 475– 476, DOI: 10.1038/493475aThere is no corresponding record for this reference.
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110Standing, C.; Standing, S.; Biermann, S. The Implications of the Sharing Economy for Transport. Transp. Rev. 2018, 1–17, 1, DOI: 10.1080/01441647.2018.1450307There is no corresponding record for this reference.
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111Meyer, G.; Shaheen, S. Disrupting Mobility: Impacts of Sharing Economy and Innovative Transportation on Cities (Lecture Notes in Mobility); Springer International Publishing, 2017. DOI: 10.1007/978-3-319-51602-8 .There is no corresponding record for this reference.
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113LaMondia, J. J.; Fagnant, D. J.; Qu, H.; Barrett, J.; Kockelman, K. Shifts in Long-Distance Travel Mode Due to Automated Vehicles. Transp. Res. Rec. 2016, 2566, 1– 11, DOI: 10.3141/2566-01There is no corresponding record for this reference.
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117Sorensen, P.; Ecola, L.; Wachs, M. Emerging Strategies in Mileage-Based User Fees. Transp. Res. Rec. 2013, 2345 (1), 31– 38, DOI: 10.3141/2345-05There is no corresponding record for this reference.
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Supporting Information
Supporting Information
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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.8b00127.
Short description of CAV components (PDF)
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