University of Illinois Urbana-Champaign

Speed Harmonization--Design Speed vs. Operating Speed

Jiang, Zhoutong; Jadaan, Khair; Ouyang, Yanfeng

Content Files
FHWA-ICT-16-019.pdf

Permalink

https://hdl.handle.net/2142/93364

Description

Title
Speed Harmonization--Design Speed vs. Operating Speed
Author(s)
  • Jiang, Zhoutong
  • Jadaan, Khair
  • Ouyang, Yanfeng
Issue Date
2016-10
Keyword(s)
  • safety impacts
  • design speed
  • operating speed
  • geometric design
  • crash rate
  • benefit-cost analysis
Date of Ingest
2016-11-11T20:13:04Z
Abstract
When the actual operating speed on the roads exceeds the design speed, which is common on rural highways, the roadway design may become problematic from a safety point of view. This report presents a new methodology that summarizes the relationship between design speed and operating speed, as well as the safety impacts of various geometric elements. A comprehensive literature review and a series of interviews with Illinois county engineers were conducted to summarize the currentroadway design and maintenance practices and their impacts on Illinois roadway safety. An integrated modeling framework that includes modules for (1) geometric design simulation, (2) operating speed‐profile prediction, and (3) crash rate prediction, is proposed. Based on this research, a benefit–cost analysis was also developed to quantify the economic benefits of various strategies for roadway safety improvement. All models were programmed into an Excel VBA‐based computer tool to facilitate decision making. The outcome of this project may be suitable for implementation in a wide range of application contexts.
Publisher
Illinois Center for Transportation/Illinois Dnepartment of Transportation
Series/Report Name or Number
ICT-16-021; FHWA-ICT-16-019
ISSN
0197-9191
Type of Resource
text
Genre of Resource
  • Journal (whole)
  • Technical Report
Language
en
Permalink
http://hdl.handle.net/2142/93364
Sponsor(s)/Grant Number(s)
Illinois Department of Transportation, R27-SP30
Copyright and License Information
No restrictions. This document is available through the National Technical Information Service, Springfield, VA 22161.

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Research and Publications - Illinois Center for Transportation PRIMARY