道路项目公私伙伴关系对交通安全的影响:碰撞频率的探索性实证分析

IF 12.5 1区 工程技术 Q1 PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH
Sarvani Sonduru Pantangi , Grigorios Fountas , Md Tawfiq Sarwar , Abhishek Bhargava , Satish B. Mohan , Peter Savolainen , Panagiotis Ch. Anastasopoulos
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引用次数: 6

摘要

自2000年代中期以来,在交通基础设施项目中建立了公私合作伙伴关系(PPP),作为传统采购流程的有效替代方案,例如设计-投标-建造,其中设计和施工分别按顺序授予私营公司。PPP合同既确保了私营部门的更多参与,也确保了项目交付的共同责任。然而,在项目实施过程中,各种PPP方式与交通安全状况之间的相互关系迄今尚未得到深入探讨。本文试图从运输安全的角度对不同的PPP承包方式进行调查,以提供对其绩效的新见解。为此目的,进行了统计分析,以区分在公路项目合同期内发生的事故特征方面的差异。利用1996年至2011年间在美国多个州执行的645份PPP合同的数据,开发了事故频率的统计数据模型。为了考虑未观察到的因素对碰撞频率的影响,估计了均值具有异质性的相关随机参数模型。统计分析的结果总体上表明,崩溃频率的决定因素及其影响程度因PPP类型而异。成本较高、工期较短、覆盖车道里程较少、资产作业活动较多的合同,以及具有较好路面和排水条件、低至中等AADT和较高肩宽的道路合同,更有可能发生更少的事故。此外,几个变量导致了相关的随机参数(如车道里程的合同规模和卡车百分比),其分布特征受到其他外生因素(如路面特征)的影响,从而揭示了不同PPP方法安全性能的异质性模式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The impact of public–private partnerships for roadway projects on traffic safety: An exploratory empirical analysis of crash frequencies

Since the mid-2000s, Public–Private Partnerships (PPP) have been established in transportation infrastructure projects as an effective alternative to the traditional procurement process, such as design-bid-build where the design and construction are awarded separately and sequentially to private firms. PPP contracts ensure both greater participation of the private sector, as well as shared responsibility in project delivery. However, the interrelationship between various PPP approaches and the status of traffic safety during the project implementation has not been thoroughly explored to date. This paper seeks to provide new insights into the performance of different PPP contracting approaches by investigating them from the perspective of transportation safety. To that end, a statistical analysis is conducted in order to distinguish differences with respect to the characteristics of crashes that occurred during the contractual period of roadway projects. Using data from 645 PPP contracts that were executed across multiple States of the US between 1996 and 2011, count data models of crash frequencies are developed. To take into account the effect of unobserved factors on crash frequencies, correlated random parameter models with heterogeneity in the means are estimated. The results of the statistical analysis overall show that the determinants of crash frequencies and the magnitude of their impacts vary across PPP types. Contracts with higher cost, shorter duration, fewer lane-miles to be covered, more asset work activities, as well as contracts for roadways featuring better pavement and drainage conditions, low to medium AADT, and higher width of shoulder are more likely to observe fewer crashes. Additionally, several variables resulted in correlated random parameters (such as, contract size in lane-miles and truck percentage), with their distributional characteristics being affected by other exogenous factors (such as pavement characteristics), thus unveiling the heterogeneous patterns underpinning the safety performance of different PPP approaches.

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来源期刊
CiteScore
22.10
自引率
34.10%
发文量
35
审稿时长
24 days
期刊介绍: Analytic Methods in Accident Research is a journal that publishes articles related to the development and application of advanced statistical and econometric methods in studying vehicle crashes and other accidents. The journal aims to demonstrate how these innovative approaches can provide new insights into the factors influencing the occurrence and severity of accidents, thereby offering guidance for implementing appropriate preventive measures. While the journal primarily focuses on the analytic approach, it also accepts articles covering various aspects of transportation safety (such as road, pedestrian, air, rail, and water safety), construction safety, and other areas where human behavior, machine failures, or system failures lead to property damage or bodily harm.
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