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Title:

Examining Safety on Two-Lane and Multilane Highways in Consideration of Access Spacing

Accession Number:

01708077

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/03611981

Abstract:

Access management strategies, such as the introduction of minimum access point spacing criteria and turning movement restrictions, have been shown to be important elements in optimizing the operational and safety performance of roadway segments. The relationship between safety and these types of access policies is a complex issue, and the impacts of such features on traffic crashes is critical to the development of appropriate access management strategies. The purpose of this study was to provide a quantitative evaluation of how crash risk on multilane and two-lane highways varies with respect to access spacing in support of the development of a revised access management policy. Data were obtained for approximately 1,247 and 5,795?mi of segments across multilane and two-lane highways, respectively. Crash data were obtained for a five-year period from 2012 to 2016 and a series of random effect negative binomial regression models were estimated for each facility to examine the association between crash frequency, access point spacing, and traffic volume. For both facility types, crashes were found to increase consistently as the average spacing of access points along road segments decreased. Crash rates were highest when consecutive accesses were within 150?ft of one another and the frequency of crashes decreased substantively as spacing was increased to 300?ft and, particularly, 600?ft. With spacing beyond 600?ft, crash rates continued to decrease, although these improvements were less pronounced than at the lower range of values. These findings were generally consistent on multilane and two-lane highways.

Supplemental Notes:

The Standing Committee on Access Management (AHB70) peer-reviewed this paper (19-05377). © National Academy of Sciences: Transportation Research Board 2019.

Language:

English

Authors:

Hamzeie, Raha
Megat-Johari, Megat-Usamah
Thompson, Iftin
Barrette, Timothy P
Kirsch, Trevor
Savolainen, Peter T

Pagination:

pp 388-397

Publication Date:

2019-11

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Volume: 2673
Issue Number: 11
Publisher: Sage Publications, Incorporated
ISSN: 0361-1981
EISSN: 2169-4052
Serial URL: http://journals.sagepub.com/home/trr

Media Type:

Web

Features:

Figures; References (22) ; Tables

Subject Areas:

Design; Highways; Safety and Human Factors

Files:

TRIS, TRB, ATRI

Created Date:

Jun 16 2019 3:04PM