TRB Pubsindex
Text Size:
x

« Prev Next »

Return to Results | New Search

Bookmark and Share

Title:

Access Separation at Interchanges: Examining Crash Rates on the Cross-Street and in the Transition Areas from Full to Partial Access Control

Accession Number:

01665952

Record Type:

Component

Availability:

Find a library where document is available


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

Abstract:

Access control remains an important concern to roadway agencies as the spacing of at-grade access points significantly affects both the safety and operational performance of highways. Significant variability exists with respect to policies dictating where the first access points may occur in the vicinity of interchanges. This study examines two important spacing criteria, which include: (1) the distance from the freeway off-ramp to the first access on the interchanging arterial roadway; and (2) the distance from a freeway on-ramp to the first at-grade intersection in areas with partial access control. To investigate these relationships, a series of crash prediction models were estimated that examined how crash risk changed with respect to access spacing while controlling for the effects of traffic volume and other pertinent characteristics. The results illustrate that at cross-streets near ramp terminal intersections, the crash rate generally increases as the distance to the nearest access point decreases. The same trend was also true of freeway transition areas. Ultimately, this research illustrates a complex relationship that exists among the proximity of the exit point of the controlled access facility and the adjacent access point, the volume of traffic along the roadway, and the volume of traffic at the access point.

Supplemental Notes:

The Standing Committee on Access Management (AHB70) peer-reviewed this paper (18-00009). © National Academy of Sciences: Transportation Research Board 2018.

Report/Paper Numbers:

18-00009

Language:

English

Authors:

Barrette, Timothy P
Warner, Jacob
Thompson, Patricia
Savolainen, Peter T

Pagination:

pp 1-10

Publication Date:

2018-12

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Volume: 2672
Issue Number: 17
Publisher: Transportation Research Board
ISSN: 0361-1981

Media Type:

Digital/other

Features:

Figures; References (16) ; Tables

Subject Areas:

Highways; Operations and Traffic Management; Safety and Human Factors

Source Data:

Transportation Research Board Annual Meeting 2018 Paper #18-00009

Files:

TRIS, TRB, ATRI

Created Date:

Dec 22 2017 10:33AM