Title

New Method For Estimating Freeway Incident Congestion

Abstract

Incidents are a major cause of travel delays on urban freeways. This paper describes development and application of a new method for estimating freeway incident congestion where extensive loop and incident data are available. Using shock wave analysis, a time-space domain is determined for each incident. This is used to define the congestion boundaries of an incident and to decide whether the incident should be analyzed as isolated or as a multiple-incident case. The freeway section is divided into smaller segments, each segment containing only one mainline loop station. Traffic speed and counts at freeway mainline stations and traffic counts at on/off ramp stations upstream and downstream of the incident location are used to calculate incident delay on each segment during small time slices, then cumulative incident delay is calculated. Satisfactory results were achieved when the new method was applied to a sample of isolated and multiple-incident cases collected recently as part of the Freeway Service Patrol Evaluation Project on I-880 in California.

Publication Date

7-1-1995

Publication Title

Transportation Research Record

Issue

1494

Number of Pages

30-39

Document Type

Article

Personal Identifier

scopus

Socpus ID

0029333985 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0029333985

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