Free-flow vs car-following speeds: does the difference matter?
The result's identifiers
Result code in 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>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Free-flow vs car-following speeds: does the difference matter?
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>SC</sub> - Article in a specialist periodical, which is included in the SCOPUS database
CEP classification
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OECD FORD branch
20104 - Transport engineering
Result continuities
Project
<a href="/en/project/ED2.1.00%2F03.0064" target="_blank" >ED2.1.00/03.0064: Transport R&D Centre</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Advances in Transportation Studies
ISSN
1824-5463
e-ISSN
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Volume of the periodical
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Issue of the periodical within the volume
40
Country of publishing house
IT - ITALY
Number of pages
10
Pages from-to
17-26
UT code for WoS article
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EID of the result in the Scopus database
2-s2.0-84994106444