Safety performance functions for ramp terminals at diamond interchanges.

Lyon, Craig; Persaud, Bhagwant; Hahn, Jeremy

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Safety performance functions for ramp terminals at diamond interchanges.

2011-07-01
By Lyon, Craig ; Persaud, Bhagwant ; Hahn, Jeremy

File Language:

English

Details

Creators:

Lyon, Craig ; Persaud, Bhagwant ; Hahn, Jeremy
Corporate Creators:

Persaud Lyon, Inc.
Corporate Contributors:

Colorado. Dept. of Transportation. Research Branch ; United States. Federal Highway Administration
Subject/TRT Terms:
Publication/ Report Number:

CDOT-2011-9
Resource Type:

Tech Report
Geographical Coverage:

Colorado
Corporate Publisher:

Colorado. Dept. of Transportation. Research Branch
Abstract:

This report documents two efforts to support CDOT in the area of Safety Performance Function (SPF) ; development. The first involved the data collection and development of SPFs for five categories of ramp ; terminals at diamond interchanges. For each category, data for the period 2000 to 2006 were collected at sites ; selected to ensure statewide geographical representation and coverage of the range of traffic volume and other ; variables in each category. The second effort involved estimating the overdispersion parameters for a number ; of existing SPFs already in use by CDOT for various roadway segment categories. These parameters are ; required for implementing the state-of-the-art empirical Bayes procedure for various safety management ; processes. The development of SPFs for the five categories of ramp terminals was successful. Separate SPFs ; were developed for total and for injury (fatal+injury) accidents. The calibration of overdispersion parameters ; for the existing roadway segment SPFs was also successful.
Format:

PDF
Funding:

90.73
Download URL:

https://rosap.ntl.bts.gov/view/dot/22500/dot_22500_DS1.pdf
File Type:

[PDF - 2.14 MB]
Collection(s):

US Transportation Collection
Main Document Checksum:

urn:sha-512:8b4cea5e5e5240859b44301b4dcee0616e745f5881a50014fd94fcb688c3374a65fa2840fbd59744bed62e2c6d1fa7f97e0c2be584681f8d4424b7d1b4635a5b

File Language:

English

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