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Title:

Public-Private Partnerships for Roadway Construction and Preservation, and Traffic Safety: An Exploratory Empirical Analysis of Crash Frequencies

Accession Number:

01698429

Record Type:

Component

Abstract:

Public-Private Partnership (PPP) in transportation infrastructure projects is a promising alternative to the traditional approaches where work is either done in-house or is done by hiring contractors to do a few specific tasks depending on availability of transportation agency resources. PPP contracts ensure greater private sector participation and responsibility in project delivery. Different contracting approaches have been used over the past couple of decades. This paper seeks to provide important insights into the different PPP contracting approaches by comparing them from the perspective of transportation safety, i.e., by comparing number of crashes during the contract execution period. An assessment of whether the safety performance of the identified PPP contract types is different or not has been made. Using data from 645 PPP contracts that were executed across multiple states in the US between 1996 and 2011, crash count data models were developed taking into consideration unobserved heterogeneity and heterogeneity in means. The results show that several contract characteristics (contract cost, duration, size in lane-mile), pavement condition, road geometry (shoulder width, median, intersection), traffic characteristics (AADT, truck percentage), and contract work activities affect safety during execution of the contract. Cost plus time (A+B) and incentives/disincentives (I/D) contract types were in general observed to be safer in overall model. The random parameters revealed the mixed effect of the variables on crash count. Crashes were less for contracts that have high cost, shorter duration, cover less lane-miles, more asset work activities and executed at sites with better pavement and drainage conditions; more lanes, curves and junctions.

Supplemental Notes:

This paper was sponsored by TRB committee AHD10 Standing Committee on Maintenance and Operations Management.

Report/Paper Numbers:

19-01336

Language:

English

Corporate Authors:

Transportation Research Board

Authors:

Sarwar, Md Tawfiq
Bhargava, Abhishek
Pantangi, Sarvani Sonduru
Anastasopoulos, Panagiotis Ch
Mohan, Satish B

Pagination:

8p

Publication Date:

2019

Conference:

Transportation Research Board 98th Annual Meeting

Location: Washington DC, United States
Date: 2019-1-13 to 2019-1-17
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

References

Subject Areas:

Construction; Highways; Maintenance and Preservation; Pavements; Safety and Human Factors

Source Data:

Transportation Research Board Annual Meeting 2019 Paper #19-01336

Files:

TRIS, TRB, ATRI

Created Date:

Dec 7 2018 9:22AM