How automated speed enforcement may reduce travel time variability and result in travel time savings: the case study of the loop 101 speed enforcement program in Scottsdale, Arizona

Shin, Kangwon, Washington, Simon P. and Choi, Keechoo (2011) How automated speed enforcement may reduce travel time variability and result in travel time savings: the case study of the loop 101 speed enforcement program in Scottsdale, Arizona. Ksce Journal of Civil Engineering, 15 1: 167-174. doi:10.1007/s12205-011-0868-7


Author Shin, Kangwon
Washington, Simon P.
Choi, Keechoo
Title How automated speed enforcement may reduce travel time variability and result in travel time savings: the case study of the loop 101 speed enforcement program in Scottsdale, Arizona
Journal name Ksce Journal of Civil Engineering   Check publisher's open access policy
ISSN 1976-3808
1226-7988
Publication date 2011-01-01
Year available 2010
Sub-type Article (original research)
DOI 10.1007/s12205-011-0868-7
Open Access Status Not yet assessed
Volume 15
Issue 1
Start page 167
End page 174
Total pages 8
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Abstract The city of Scottsdale Arizona implemented the first fixed photo Speed Enforcement camera demonstration Program (SEP) on a US freeway in 2006. A comprehensive before-and-after analysis of the impact of the SEP on safety revealed significant reductions in crash frequency and severity, which indicates that the SEP is a promising countermeasure for improving safety. However, there is often a tradeoff between safety and mobility when safety investments are considered. As a result, identifying safety countermeasures that both improve safety and reduce Travel Time Variability (TTV) is a desirable goal for traffic safety engineers. This paper reports on the analysis of the mobility impacts of the SEP by simulating the traffic network with and without the SEP, calibrated to real world conditions. The simulation results show that the SEP decreased the TTV: the risk of unreliable travel was at least 23% higher in the ‘without SEP’ scenario than in the ‘with SEP’ scenario. In addition, the total Travel Time Savings (TTS) from the SEP was estimated to be at least ‘569 vehicle-hours/year.’ Consequently, the SEP is an efficient countermeasure not only for reducing crashes but also for improving mobility through TTS and reduced TTV.
Keyword Microscopic simulation
Photo enforcement
Safety
Travel time savings
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
 
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