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Traffic safety versus traffic flow on freeways – an empirical analysis

Bieker, Laura and Biemann, Ronny and Hoffmann, Ragna and Junghans, Marek and Toledo, Tomer and Wagner, Peter (2014) Traffic safety versus traffic flow on freeways – an empirical analysis. 27th ICTCT Workshop, 16,-17. Okt. 2014, Karlsruhe, Deutschland.

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Abstract

For freeways, there is a well-known relationship between traffic flow and traffic safety. Roughly independent of the geographical location, traffic is fairly safe (measured in accidents per million miles) for intermediate traffic flows, while it is getting worse for very small or very high traffic flows close to congestion. Furthermore, the very nature of the accident type changes with traffic flow: while the peak at small traffic flow is due to accidents with one or with two vehicles, the peak at large traffic flow is from accidents where almost always two vehicles are involved. Being known for a very long time (already in 1937 the work of Veh [3] demonstrates a weak relationship), there seems to be little effort required to find this effect also in surrogate safety measures (SSM). This will be dealt with in the paper. By analysing single vehicle data from a German freeway, some of the commonly used SSMs will be computed and their distribution analysed. Not surprisingly, these distributions seem to belong to the family of Generalized Extreme Value (GEV) type. Furthermore, by analysing the number of critical situations defined as the 97%-percentile of the corresponding distribution, at least the peak at small traffic flows can be reproduced with the SSM’s analysed so far.

Item URL in elib:https://elib.dlr.de/94421/
Document Type:Conference or Workshop Item (Poster)
Title:Traffic safety versus traffic flow on freeways – an empirical analysis
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bieker, Lauralaura.bieker (at) dlr.deUNSPECIFIED
Biemann, Ronnyronny.biemann (at) dlr.deUNSPECIFIED
Hoffmann, Ragnaragna.hoffmann (at) dlr.deUNSPECIFIED
Junghans, Marekmarek.junghans (at) dlr.deUNSPECIFIED
Toledo, TomerTechnion, ILUNSPECIFIED
Wagner, Peterpeter.wagner (at) dlr.deUNSPECIFIED
Date:17 October 2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:DRAC, traffic conflict technique, surrogate safety measures
Event Title:27th ICTCT Workshop
Event Location:Karlsruhe, Deutschland
Event Type:Workshop
Event Dates:16,-17. Okt. 2014
Organizer:Factum OHG
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Traffic Management (old)
DLR - Research area:Transport
DLR - Program:V VM - Verkehrsmanagement
DLR - Research theme (Project):V - MM2M - Mobilitätsmanagement für Morgen (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Transportation Systems > Traffic Management
Deposited By: Junghans, Marek
Deposited On:21 Jan 2015 14:44
Last Modified:21 Jan 2015 14:44

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