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2 HOV Facilities OVERVIEW AND SUMMARY High Occupancy Vehicle (HOV) facilities provide preferential treatment for transit, vanpools, car- pools, and other designated vehicles by providing lanes and roadways reserved for their use. HOV and bus-only lanes in separate rights-of-way, on freeways and tollways, on ramps, and on arteri- als and city streets are among the approaches used for giving HOV priority over general traffic. There are numerous applications and treatments found within each of these approaches, with var- ious HOV eligibility provisions. This chapter covers the traveler response to HOV applications, except for busways primarily on their own alignment, which are addressed in Chapter 4, "Busways, BRT and Express Bus." The traveler response to and related implications of High Occupancy Toll (HOT) lanes and similar value pricing programs are found in Chapter 14, "Road Value Pricing," except for context and limited post-2003 HOT lane updates provided here in recog- nition of the fast-paced release of relevant findings. Within this "Overview and Summary" section: "Objectives of HOV Facilities" delineates the goals and objectives of HOV facilities. "Types of HOV Facilities and Treatments" categorizes and describes the characteristics of the various HOV facilities, treatments and programs, for purposes of organization. "Analytical Considerations" describes the limitations of the available research, and the con- straints thereby imposed on conclusions which may be drawn. "Traveler Response Summary" highlights the travel demand findings presented in the remain- der of the chapter. It is strongly suggested that the first three sections of this "Overview and Summary" be read for context before undertaking use of either the summary itself or of the material that follows. Following the four-part "Overview and Summary" is the full presentation: "Traveler Response by Type of HOV Application" identifies individual applications within each category and presents available usage characteristics, related travel data, and user response to HOV facilities. "Underlying Traveler Response Factors" explores the parameters that make successful HOV facilities attractive, and the mode choice mechanisms and decisions involved. "Related Information and Impacts" presents special related subtopics including an examina- tion of conditions associated with the more substantial HOV facility volumes. "Case Studies" expands on five illustrative examples of HOV facility applications. 2-1