Transportation Management Centers: Traveler Information Dissemination Strategies. Final Report

Alsop, S. C. · 1996 · ROSA P / United States. Federal Highway Administration

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Summary

This 1996 report by the Federal Highway Administration documents the strategies used by Transportation Management Centers (TMCs) across the United States to disseminate real-time traveler information. The study was motivated by the growing problem of traffic congestion and the recognition that expanding roadway capacity was no longer feasible due to economic, political, and environmental constraints. Consequently, traffic management and the efficient distribution of information to help travelers adjust their modes, routes, and departure times became critical priorities. The report aims to quantify existing dissemination strategies and make this inventory available to the public and practitioners. The research methodology involved a nationwide survey of TMCs. Thirty-three written surveys were distributed, with 31 completed and returned by February 1996. Additionally, twenty follow-up telephone interviews were conducted to gather detailed operational data. The report categorizes dissemination strategies into two types: pre-trip information, accessed by travelers before their journey begins, and en-route information, received during travel. Pre-trip methods include cable television (CATV), personal computers via the Internet, interactive information kiosks, and dial-in telephone systems. En-route methods include Variable Message Signs (VMS), Highway Advisory Radio (HAR), and commercial radio broadcasts. The report details specific implementations, such as CATV partnerships for live video feeds, Internet sites displaying real-time speed graphics and camera snapshots, and kiosks providing location-specific data. The findings reveal significant variation among the 31 responding TMCs, with no single strategy identified as universally superior. Many centers utilized a combination of technologies. For instance, Phoenix employed VMS, Internet web pages, and a pilot Radio Broadcast Data System, while Los Angeles relied heavily on VMS, HAR, and media partnerships. The report highlights the emergence of public/private partnerships, where private entities assist in software development, equipment provision, and information dissemination. Specific challenges noted include the limited coverage radius of HAR, the cumbersome maintenance of certain systems, and the subjective nature of evaluating effectiveness due to a lack of formal user surveys or funding for evaluation studies. Some centers, like San Diego, reported high usage of Internet-based information, while others noted that commercial radio remained the most effective en-route tool due to its wide reach. The report concludes that a combination of pre-trip and en-route dissemination strategies is necessary to maximize benefits for travelers. It emphasizes that TMCs serve as hubs for collecting, processing, and distributing data, enabling travelers to make informed decisions. The study underscores the importance of public/private partnerships in sustaining these systems and notes that while technologies are evolving, the integration of multiple dissemination channels is essential for effective traffic management. The findings provide a baseline inventory of ITS applications in 1996, highlighting the transition from static information systems to dynamic, real-time data distribution networks.

Key finding

A combination of pre-trip and en-route traveler information dissemination strategies is needed for the greatest benefit to travelers.

Methodology

survey

Sample size: 31

Provenance

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