Illusion of Motion: Variation of Subjective Value of Travel Time on Freeways and Ramp Meters
This paper explores drivers' subjective value of time under moving and stopped freeway travel conditions using a stated preference survey. Unlike previous studies that assume a constant value of time, this research relates perceived satisfaction of a freeway trip to its quality indicators. Sixty-nine subjects in the Twin Cities are asked in the survey to rank sixteen driving scenarios in four condition sets with different durations of ramp wait and freeway travel. Several utility functions are specified where the weight of ramp delay is a function of the length of the delay itself and subject specific variables, and the resulting choice models estimated using rank-ordered logit and binary logit techniques. Results suggest that drivers perceive ramp wait as more onerous than freeway travel. Drivers also weight each minute of ramp wait more heavily as the length of the delay gets longer. Although the subjects show some tolerance to the first several minutes of ramp delay (less than 5 minutes), they perceive long delays as much as twelve times more onerous than time in motion. The derived weighting function for ramp wait can improve the design of freeway traffic control strategies that trade-off freeway delay with ramp wait. The findings also enable a more utility-based approach for freeway operations than the current method which has the engineering efficiency objective of minimizing total system delay or maximizing throughput. Minimizing total perceived travel time is probably more appropriate than minimizing total absolute travel time which does not take into account driver acceptance. The weighting function can also be easily transformed into a value of time function for project evaluation purposes.
|Date of creation:||2007|
|Publication status:||Published in Transportation Research Record: Journal of the Transportation Research Board 2135 34-42|
|Contact details of provider:|| Postal: Dept. of Civil Engineering, 500 Pillsbury Drive SE, Minneapolis, MN 55455|
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Web page: http://nexus.umn.edu
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- Lam, Terence C. & Small, Kenneth A., 0.
"The value of time and reliability: measurement from a value pricing experiment,"
Transportation Research Part E: Logistics and Transportation Review,
Elsevier, vol. 37(2-3), pages 231-251, April.
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- Lam, Terence C. & Small, Kenneth A., 2003. "The Value of Time and Reliability: Measurement from a Value Pricing Experiment," University of California Transportation Center, Working Papers qt47s4z7z5, University of California Transportation Center.
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- Levinson, David & Zhang, Lei, 2006. "Ramp meters on trial: Evidence from the Twin Cities metering holiday," Transportation Research Part A: Policy and Practice, Elsevier, vol. 40(10), pages 810-828, December.
- David Levinson & Lei Zhang, 2006. "Ramp Meters on Trial: Evidence from the Twin Cities Metering Holiday," Working Papers 200604, University of Minnesota: Nexus Research Group.
- Lei Zhang & David Levinson, 2005. "Balancing Efficiency and Equity of Ramp Meters," Working Papers 200508, University of Minnesota: Nexus Research Group.
- Calfee, John & Winston, Clifford, 1998. "The value of automobile travel time: implications for congestion policy," Journal of Public Economics, Elsevier, vol. 69(1), pages 83-102, July.
- David Levinson & Kathleen Harder & John Bloomfield & Kasia Winiarczyk, 2004. "Weighting Waiting: Evaluating the Perception of In-Vehicle Travel Time Under Moving and Stopped Conditions," Working Papers 200401, University of Minnesota: Nexus Research Group. Full references (including those not matched with items on IDEAS)
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