Trip reduction ordinances (tros) are local or regional regulations for implementing transportation supply or demand management strategies that improve transportation system efficiency. Perhaps as manyas 50 local, regional, and state tros have been passed, depending on how tros are defined. Most tros operate at the municipal level of government, and are intended to mitigate existing or future traffic congestion. Most tros apply to both new and existing development. Tro implementation strategies vary considerably, but often include theprovision of employee transportation coordinators and the development of site-specific transportation management plans. Tros lean slightly toward demand side provisions, but often include supply side provisions as well. Most tros encompass some mandatory provisions, but voluntary and optional measures usually are included as well. The vote is still out on tro effectiveness. Many jurisdictions are grappling with the issue of tro performance monitoring and evaluation. Recommendations for promoting greater consistency in tro evaluation across jurisdictions are made, including suggested sample design and survey methods. This paper appears in transportation research record no. 1321, Rideshare programs: evaluation of effectiveness, trip reduction programs, demand management, and commuter attitudes 1991.
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