Dynamic Ride-Sharing and Optimal Fleet Sizing for a System of Shared Autonomous Vehicles
Shared autonomous (fully-automated) vehicles (SAVs) represent an emerging transportation mode for driverless and on-demand transport. Early actors include Google and Europe’s CityMobil2, who are seeking early pilot deployments in low-speed settings. This work seeks to understand SAVs’ potential for U.S. urban areas via multiple applications across the Austin, Texas, network. This work describes advances to existing agent- and network-based SAV simulations by enabling dynamic ride-sharing (DRS, to pool multiple travelers with similar origins, destinations and departure times in the same vehicle), optimizing fleet sizing, and anticipating profitability for operators in settings with no speed limitations on the vehicles and at adoption levels below 10 percent of all personal trip-making in the region. Results suggest that DRS reduces total service times (wait times plus in-vehicle travel times) and travel costs for SAV users, even after accounting for extra passenger pick-ups, drop-offs and non-direct routings. While the base-case scenario (serving 56,324 person-trips per day, on average) showed that a fleet of SAVs allowing for DRS may result in vehicle-miles traveled that exceed person-trip miles demanded (due to anticipatory relocations of empty vehicles, between trip calls), it is possible to reduce overall VMT as trip-making intensity (SAV membership) rises and/or DRS users become more flexible in their trip timing and routing. Finally, these simulation results suggest that a private fleet operator paying $70,000 per new SAV could earn a 19% annual (long-term) return on investment while offering SAV services at $1.00 per mile of a non-shared trip (which is less than a third of Austin’s average taxi cab fares).
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Supplemental Notes:
- This paper was sponsored by TRB committee AP040 Automated Transit Systems. Alternate title: Dynamic Ridesharing and Optimal Fleet Sizing for System of Shared Autonomous Vehicles.
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Corporate Authors:
500 Fifth Street, NW
Washington, DC United States 20001 -
Authors:
- Fagnant, Daniel J
- Kockelman, Kara M
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Conference:
- Transportation Research Board 94th Annual Meeting
- Location: Washington DC, United States
- Date: 2015-1-11 to 2015-1-15
- Date: 2015
Language
- English
Media Info
- Media Type: Digital/other
- Features: Figures; Maps; References; Tables;
- Pagination: 17p
- Monograph Title: TRB 94th Annual Meeting Compendium of Papers
Subject/Index Terms
- TRT Terms: Benefit cost analysis; Demand responsive transportation; Fleet management; Intelligent vehicles; Ridesharing; Travel demand; Vehicle sharing
- Geographic Terms: Austin (Texas)
- Subject Areas: Administration and Management; Economics; Planning and Forecasting; Public Transportation; I10: Economics and Administration; I72: Traffic and Transport Planning;
Filing Info
- Accession Number: 01551097
- Record Type: Publication
- Report/Paper Numbers: 15-1962
- Files: TRIS, TRB, ATRI
- Created Date: Jan 27 2015 11:21AM