United States Department of Transportation
i
Effects of an HOV-2 to HOT-3 conversion on traveler behavior : evidence from a panel study of the I-85 corridor in Atlanta.
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2014-04-01
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[PDF-4.03 MB]
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Abstract:This paper uses a two-stage panel survey approach, with roughly 1,600 respondent
households, to analyze the impacts of a federally sponsored variable tolling
program on the I-85 corridor northeast of Atlanta. The focus is on corridor
users’ daily travel choices and opinions. Key survey findings include a decrease
in respondents’ travel in the corridor after tolling, including on I-85. However,
changes in travel varied by lane; while travel declined in the general purpose
lanes, there was an increase in both the number of trips, as well as the number of
respondents utilizing the Express Lanes, as compared to the former HOV lane. The
largest share of trips in the Express lanes (82%)was solo drivers who paid the
toll. Vehicle occupancy declined dramatically in the Express Lanes, as carpoolers
tended to shift onto the general purpose lanes, and conversely, there was a
significant increase in vehicle occupancy in the general purpose lanes. There
were small (but not statistically significant) increases in transit mode share in
the corridor, while carpooling and telecommuting levels increased slightly, but
the changes cannot be attributed to tolling. In the post-tolling survey, reported
satisfaction with travel time, travel speed and reliability of individual trips
varied by key user groups: Wave 1 HOV-2 users became significantly less satisfied,
whereas Express Lane users became more satisfied. Overall, personal attitudes
toward tolling became significantly more negative after the deployment of pricing.
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