Left or right shoulders can be strategically opened as travel lanes, and "part-time shoulder use" is defined as using a shoulder "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 1: Informational Guide and Safety Evaluation Guidelines provides an overview of part-time shoulder use, presents the results of past operational studies, and presents the results of safety research conducted through NCHRP's Safety Performance of Part-time Shoulder Use on Freeways project.
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 2: Conduct of Research Report.
Table of Contents
|PART I: PTSU Informational Guide||1-1|
|Part I Contents||2-2|
|PTSU Predictive Safety Analysis||12-13|
|PART II: PTSU Safety Evaluation Guidelines||16-16|
|Part II Contents||17-19|
|Chapter 1 Crash Prediction Model Overview||21-30|
|Chapter 2 Draft Highway Safety Manual Text||31-106|
|Chapter 3 Spreadsheet Tool||107-113|
|Chapter 4 Understanding Results||114-115|
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