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Page 225
Suggested Citation:"Acronyms." National Academies of Sciences, Engineering, and Medicine. 2021. Safety Performance of Part-Time Shoulder Use on Freeways, Volume 2: Conduct of Research Report. Washington, DC: The National Academies Press. doi: 10.17226/26393.
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Page 225

Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

227 A C R O N Y M S AADT: annual average daily traffic AASHTO: American Association of State Highway and Transportation Officials AF: adjustment factor ATR: automatic traffic recorder CMF: crash modification factors CPM: crash prediction model DOT: state department of transportation D-PTSU: dynamic part-time shoulder use FHWA: Federal Highway Administration FI: fatal-and-injury FP: fixed parameter HCM: Highway Capacity Manual HOT: high-occupancy toll HOV: high-occupancy vehicle HSIS: Federal Highway Administration's Highway Safety Information System HSM Supplement: Highway Safety Manual Supplement HSM: Highway Safety Manual LC: latent class NCHRP: National Cooperative Highway Research Program PDO: property-damage-only PTSU: part-time shoulder use RP: random parameter SDF: severity distribution function SPF: safety performance function S-PTSU: static part-time shoulder use VSL: variable speed limit

Next: Appendix A: Data Collection Procedures Guide »
Safety Performance of Part-Time Shoulder Use on Freeways, Volume 2: Conduct of Research Report Get This Book
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Part-time shoulder use is a congestion relief strategy that allows use of the left or right shoulders as travel lanes during some, but not all, hours of the day.

The TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 309: Safety Performance of Part-Time Shoulder Use on Freeways, Volume 2: Conduct of Research Report describes the development of crash prediction models for freeways with PTSU operation.

Supplemental to the document is a Freeway Analysis Tool, which includes BOS Data, S D PTSU Data, and a Prediction Tool, as well as NCHRP Web-Only Document 309: Safety Performance of Part-Time Shoulder Use on Freeways, Volume 1: Informational Guide and Safety Evaluation Guidelines.

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