A comprehensive safety assessment methodology for innovative geometric designs.

Lloyd, Holly; Song, Ziqi; Utah State University. Department of Civil and Environmental Engineering

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A comprehensive safety assessment methodology for innovative geometric designs.

2017-05-01
By Lloyd, Holly ; Song, Ziqi

[PDF-2.88 MB]

English

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Details:

Creators:

Lloyd, Holly ; Song, Ziqi

Lloyd, Holly ; Song, Ziqi Less -
Corporate Creators:

Utah State University. Department of Civil and Environmental Engineering
Corporate Contributors:

Utah. Dept. of Transportation ; United States. Federal Highway Administration

Utah. Dept. of Transportation ; United States. Federal Highway Administration Less -
Subject/TRT Terms:

[+]

Before-after Crash Modification Factor Cyclist Diamond Interchanges Diverging Diamond Interchange Empirical Bayes Geometric Design Highway Design Interchanges Pavement Design Pedestrian Safety
Publication/ Report Number:

UT- 17.07
Resource Type:

Tech Report
Geographical Coverage:

Utah ; United States

Utah ; United States Less -
Corporate Publisher:

Utah. Dept. of Transportation. Research Division
Abstract:

As the population grows and travel demands increase, alternative interchange designs have become increasingly popular. The diverging diamond interchange is an alternative design that has been implemented in the United States. This design can accommodate higher and unbalanced flow as well as improve safety at the interchange. As the diverging diamond interchange is increasingly considered as a possible solution to problematic interchange locations, it is imperative to investigate the safety effects of this interchange configuration. This report describes the selection of a comparison group of urban diamond interchanges, crash data collection, calibration of functions used to estimate the predicted crash rate in the before and after periods and the Empirical Bayes before and after analysis technique used to determine the safety effectiveness of the diverging diamond interchanges in Utah. A discussion of pedestrian and cyclist safety is also included. The analysis results demonstrated statistically significant decreases in crashes at most of the locations studied. This analysis can be used by UDOT and other transportation agencies as they consider the implementation of the diverging diamond interchanges in the future.
Format:

PDF
Funding:

15-8759 ; 5438715D

15-8759 ; 5438715D Less -
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:e576683b45c3a4bde87ea6852a2da96c21fad95808f56fed3faa8292ef3885c8
Download URL:

https://rosap.ntl.bts.gov/view/dot/32284/dot_32284_DS1.pdf
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A comprehensive safety assessment methodology for innovative geometric designs.

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