Posted Speed Limit Setting Procedure and Tool: User Guide

2021 ◽  
Author(s):  
Kay Fitzpatrick ◽  
Subasish Das ◽  
Michael P. Pratt ◽  
Karen Dixon ◽  
Tim Gates ◽  
...  
Keyword(s):  
Speed Limit ◽  
Limit Setting

Development of a Posted Speed Limit Setting Procedure and Tool

2021 ◽  
Author(s):  
Kay Fitzpatrick ◽  
Subasish Das ◽  
Michael P. Pratt ◽  
Karen Dixon ◽  
Tim Gates ◽  
...  
Keyword(s):  
Speed Limit ◽  
Limit Setting

Considering Roadway Context in Setting Posted Speed Limits

2021 ◽  
pp. 036119812199961
Author(s):  
Kay Fitzpatrick ◽  
Subasish Das ◽  
Timothy Gates ◽  
Karen K. Dixon ◽  
Eun Sug Park
Keyword(s):  
Decision Rules ◽  
Speed Limit ◽  
Operating Speed ◽  
Review Of The Literature ◽  
Speed Limits ◽  
Speed Distribution ◽  
Limit Setting ◽  
Starting Point ◽  
Unique Decision ◽  
National Cooperative

The National Cooperative Highway Research Program (NCHRP) Project 17-76 investigated factors that influence operating speed and safety through a review of the literature and an analysis of the relationships for speed, safety, and roadway characteristics on urban/suburban streets. That knowledge, along with a review of existing speed limit setting practices, was used to develop a Speed Limit Setting Procedure (SLS-Procedure) as well as a user manual to explain the SLS-Procedure. In addition, the SLS-Procedure was automated via a spreadsheet-based Speed Limit Setting Tool (SLS-Tool). These products will permit engineers to make informed decisions about the setting of speed limits. The SLS-Procedure is fact based and transparent, relying on a set of decision rules that consider both driver speed choice and safety associated with the roadway. The SLS-Procedure was designed to be applicable across different roadway types and contexts by having a set of unique decision rules for four combinations of roadway types and contexts: limited-access, undeveloped, developed, and full-access facilities. The SLS-Procedure uses the operating speed distribution as a starting point for the suggested speed limit, with the resulting suggested value based on consideration of roadway type, context, safety performance, and other characteristics.

Sign in / Sign up

Export Citation Format

Share Document