Crash Comparison of Single Point and Tight Diamond Interchanges

Bared, Joe; Powell, Alvin; Kaisar, Evangelos I.; Jagannathan, Ramanujan

doi:10.1061/(ASCE)0733-947X(2005)131:5(379)

i

Crash Comparison of Single Point and Tight Diamond Interchanges

2005-05-01
By Bared, Joe ; Powell, Alvin ; Kaisar, Evangelos I.

File Language:

English

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Creators:

Bared, Joe ; Powell, Alvin ; Kaisar, Evangelos I. ; Jagannathan, Ramanujan
Corporate Creators:

United States. Federal Highway Administration
Subject/TRT Terms:
DOI:

http://dx.doi.org/10.1061/(ASCE)0733-947X(2005)131:5(379)
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

United States. Federal Highway Administration
Abstract:

Although the single point interchange (SPI) has been around for approximately 3 decades, very few attempts have been made to evaluate its safety performance with a similar configuration, the tight diamond interchange (TDI). This paper provides a crash comparison between the TDI and the SPI interchanges for intersection related crashes on the cross road only. The SPIs considered in this study are without frontage roads. Data from 27 diamond interchanges (DIs) in Washington were used in building a negative binomial model to predict total crashes and injury/fatality based on the off-ramp flow, cross-road flow, and separation distance between left and right ramp terminals. Crash analysis of 13 SPI sites was used to compare with newly developed crash models of diamond interchanges. Wilcoxon signed-rank test was applied for safety comparisons between the SPI and TDI. The safety comparison did not reveal a significant difference between the two types of interchanges neither for total crash. However, the single point urban interchanges were found to be safer than the comparable DIs for injury/fatality frequencies.
Format:

PDF
Download URL:

https://rosap.ntl.bts.gov/view/dot/55839/dot_55839_DS1.pdf
File Type:

[PDF - 40.95 KB]
Collection(s):

Federal Highway Administration
Main Document Checksum:

urn:sha-512:9552d7b4220d3f8650148ea32b80ec7abd2cb1f88f4490dfe3f2f275508928ca613ee0d1cff3e693a5285ecf7fabd6e2dbb1beb4f109e2da65c745283994e442

File Language:

English

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