Linking Rural Road Environment, Speed and Safety Factors with a Two-Stage Model: A Feasibility Study

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F44994575%3A_____%2F16%3AN0000062" target="_blank" >RIV/44994575:_____/16:N0000062 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Linking Rural Road Environment, Speed and Safety Factors with a Two-Stage Model: A Feasibility Study

Original language description

(Presented at 95th Annual Meeting of the Transportation Research Board, Washington, D.C.) Speed on two-lane rural roads is a critical safety issue. In this regards various research perspectives have been adopted, including speed models (relating speed to design consistency factors) and safety models (which estimate safety using exposure data and design consistency variables). Unfortunately both approaches have often been carried out separately, and influences on speed choice have been limited only to geometrical variables. In contrast safety models are often expanded with wide array of exposure and risk factors. The study aims to investigate the issue of speed and safety from a different perspective, using so called ‘two-stage’ model which estimates speed (using more explanatory variables) and further applies it in a simple safety performance function. This approach can be superior to the traditional approach as it preserves model parsimony while capturing the most important safety effects. The specific objective of the study is to prove feasibility of a ‘two-stage’ model in linking environment, speed and safety factors on a sample of Czech rural roads. To this end, data collection was carried out on approx. 100 km (60 mi) of two-lane rural roads in the Czech Republic, using speed data from instrumented vehicle, manually collected road environment data, as well as crash and exposure data retrieved from national databases. Both models are developed, described and compared to the literature. It is concluded that approach is feasible, in spite of several current limitations. Planned further improvements and future practical applications are also listed.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

JO - Land transport systems and equipment

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů