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

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

(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.

Název v anglickém jazyce

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

Popis výsledku anglicky

(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.

Druh

O - Ostatní výsledky

CEP obor

JO - Pozemní dopravní systémy a zařízení

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2016

Kód důvěrnosti údajů

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