Free-flow vs car-following speeds: does the difference matter?

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F44994575%3A_____%2F16%3AN0000051" target="_blank" >RIV/44994575:_____/16:N0000051 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Free-flow vs car-following speeds: does the difference matter?

Popis výsledku v původním jazyce

Speed is one of the fundamental characteristics of traffic flow and also one of the most influential risk factors – it is therefore important from the perspective of safety-related studies. For these purposes speed data are often collected by stationary radars. However, since free-flow speed is usually needed, the user has to distinguish between free-flow and congested conditions in the collected data. Although this problem has long been acknowledged, there is no single and simple approach towards it; various authors have used different threshold definitions and values. In this regard, the authors aimed to investigate the amount of difference between free-flow and congested speeds, using a series of stationary radar speed surveys on Czech rural roads. It was found that difference (in terms of vehicle gaps) between free flow speed and car-following speeds is of concern; in addition, the magnitude of these differences is not constant as suggested in previous studies. It was also shown that there is a positive relationship between the gaps and accident rates in the studied road sections. These findings should be considered in future analyses which aim to obtain unbiased results of speed and its derivatives such as a proportion of speeding for safety-related analyses.

Název v anglickém jazyce

Free-flow vs car-following speeds: does the difference matter?

Popis výsledku anglicky

Speed is one of the fundamental characteristics of traffic flow and also one of the most influential risk factors – it is therefore important from the perspective of safety-related studies. For these purposes speed data are often collected by stationary radars. However, since free-flow speed is usually needed, the user has to distinguish between free-flow and congested conditions in the collected data. Although this problem has long been acknowledged, there is no single and simple approach towards it; various authors have used different threshold definitions and values. In this regard, the authors aimed to investigate the amount of difference between free-flow and congested speeds, using a series of stationary radar speed surveys on Czech rural roads. It was found that difference (in terms of vehicle gaps) between free flow speed and car-following speeds is of concern; in addition, the magnitude of these differences is not constant as suggested in previous studies. It was also shown that there is a positive relationship between the gaps and accident rates in the studied road sections. These findings should be considered in future analyses which aim to obtain unbiased results of speed and its derivatives such as a proportion of speeding for safety-related analyses.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

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OECD FORD obor

20104 - Transport engineering

Projekt

<a href="/cs/project/ED2.1.00%2F03.0064" target="_blank" >ED2.1.00/03.0064: Dopravní VaV centrum</a><br>

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

Název periodika

Advances in Transportation Studies

ISSN

1824-5463

e-ISSN

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Svazek periodika

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Číslo periodika v rámci svazku

40

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

10

Strana od-do

17-26

Kód UT WoS článku

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EID výsledku v databázi Scopus

2-s2.0-84994106444