ON-TIME RELIABILITY IMPACTS OF ADVANCED TRAVELER INFORMATION SERVICES (ATIS), VOLUME II: EXTENSIONS AND APPLICATIONS OF THE SIMULATED YOKED STUDY CONCEPT

Abstract

This report further explores the hypothesis that the delivery of real-time roadway congestion reports from Advanced Traveler Information Systems (ATIS) provides benefit to users in urban areas over the long run primarily from improved on-time reliability and reduced stress, and only marginally from reduced in-vehicle travel time. Research at Mitretek Systems previously identified on-time reliability impacts for subscribers to a prospective notification- based pre-trip ATIS service in the Washington metropolitan area through a new analytical technique using archives of roadway travel time data. In a simulated yoked study, estimates of roadway travel times are archived from web-based Advanced Traveler Information Systems (ATIS) and used to recreate hypothetical, retrospective paired driving trials between travelers with and without ATIS. In this sequel to that report, Mitretek Systems, at the request of the Intelligent Transportation Systems (ITS) Joint Program Office (JPO) of the U.S. Department of Transportation (USDOT), investigates several hypotheses relating to the applicability of these earlier findings to metropolitan areas nationwide and the monetary value of on-time reliability improvements for long-term pre-trip ATIS users. In this report, the key finding relating to on-time reliability is further supported and extended in two larger, parallel twelve-month case studies in the Washington DC as well as the Minneapolis/St. Paul (Twin Cities) metropolitan area. Further, this study shows that annual improvements in travel reliability from a pre-trip notification service modifying both time of departure and route choice can be valued at over $1,300 for selected trips in the Washington area and over $400 in the Twin Cities area. Modification of trip timing is shown to be the most frequent and most significant pre-trip decision

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