Title

Considering various ALINEA ramp metering strategies for crash risk mitigation on freeways under congested regime

Authors

Authors

M. Abdel-Aty; A. Dhindsa;V. Gayah

Comments

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Abbreviated Journal Title

Transp. Res. Pt. C-Emerg. Technol.

Keywords

crash risk; freeway safety; ramp metering; micro-simulation; MICROSCOPIC TRAFFIC SIMULATION; Transportation Science & Technology

Abstract

This study evaluates the expected benefits of using the ALINEA ramp metering algorithm as a method for real-time safety improvement on an urban freeway. The objective of this research is to use ramp metering to produce a significant decrease in the risk of crashes on the freeway while avoiding any significant adverse effects on operation. This is achieved by simulating the freeway during the congested period in micro-simulation and testing various ramp metering configurations to determine which provides the best results. Statistical measures developed for the same stretch of freeway using loop detector data are used to quantify the risk of crashes as well as the benefits in each of the alternative strategies. The study concludes that there are significant benefits in metering multiple ramps when the feedback ramp metering algorithm is implemented at multiple locations. It was found that increasing the number of metered on-ramps produces increasing safety benefits. Also, a shorter cycle length for each of the meters and a higher critical occupancy value leads to better results. (C) 2007 Elsevier Ltd. All rights reserved.

Journal Title

Transportation Research Part C-Emerging Technologies

Volume

15

Issue/Number

2

Publication Date

1-1-2007

Document Type

Article

Language

English

First Page

113

Last Page

134

WOS Identifier

WOS:000246940500003

ISSN

0968-090X

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