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Title:

The Effect of Active Traffic Management on Travel Time Reliability: A Case Study of I-5 in Seattle, Washington

Accession Number:

01477009

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

The purpose of this study is to determine the impact that the installation of an Active Traffic Management (ATM) system has had on the travel time reliability of a seven-mile length of the I-5 corridor in Seattle, WA. The travel time reliability measures of planning time index and buffer index were used to evaluate the effectiveness of the I-5 ATM system. Using data collected from loop detectors along the highway segment, the travel time reliability of the northbound route was calculated for the period of 8 months before and after the implementation of the ATM system in August 2010. Two reliability indexes, the planning time index (PTI) and buffer index (BI), were calculated for each 5-min time interval and each day of the week for each of the 19 detector locations along the route. Paired T-tests are used to determine the significance of changes in the travel time reliability indexes. Detailed scenarios such as the time of day, weekday versus weekend, and day of week are further analyzed. The results of this study indicate significant improvement in travel time reliability in most scenarios except for the morning peak period between 6 am and 8 am which cannot be identified by only evaluating mean travel time. Furthermore, by evaluating the travel time reliability indexes, several problematic locations around the corridor are identified. In addition, 5-10% flow reduction can be observed after the deployment of ATM indicating its impact on drivers’ route choice behavior.

Supplemental Notes:

This paper was sponsored by TRB committee AHB20 Freeway Operations.

Monograph Accession #:

01470560

Report/Paper Numbers:

13-3004

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

DeGaspari, Michael
Jin, Peter J
Wall, William Jared
Walton, C Michael

Publication Date:

2013

Conference:

Transportation Research Board 92nd Annual Meeting

Location: Washington DC, United States
Date: 2013-1-13 to 2013-1-17
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Uncontrolled Terms:

Active traffic management

Geographic Terms:

Seattle (Washington)

Subject Areas:

Highways; Operations and Traffic Management; I72: Traffic and Transport Planning; I73: Traffic Control

Source Data:

Transportation Research Board Annual Meeting 2013 Paper #13-3004

Files:

TRIS, TRB, ATRI

Created Date:

Feb 5 2013 12:37PM