Benefit

Modeling indicated that coordinating fixed signal timing plans along congested arterial corridors leading into Seattle, Washington, and incorporating arterial traffic flow data into the traveler information system would reduce vehicle delay by 7 percent and 1.8 percent, respectively.


30 May 2000
Seattle,Washington,United States


Summary Information

The Metropolitan Model Deployment Initiative (MMDI) Seattle Evaluation Report detailed the results of seven ITS projects undertaken through the deployment initiative.

A modeling effort investigated the potential impact of coordinating traffic signal control between several jurisdictions along congested arterial corridors leading into Seattle.

FINDINGS

The results of the study indicated that coordinating the fixed signal timing plans along the corridor would result in a seven percent reduction in vehicle delay, with no adverse impacts to cross-streets. The model indicated that this level of benefit could be maintained across varying levels of demand and weather conditions.

The model was also used to estimate the potential impacts of incorporating information on arterial traffic flow into an Advanced Traveler Information System use to provide freeway traveler information. The system design would allow motorists to make more informed decisions about whether to divert from a congested freeway to an adjacent arterial. Researchers estimated the system would reduce vehicle delay by 1.8 percent.

The Seattle metropolitan area had a considerably high level of ITS implementation prior to the MMDI projects, therefore the experiences of localities implementing these systems under differing conditions may vary significantly from those reported in Seattle.

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Source

Seattle Metropolitan Model Deployment Evaluation Report

Author: Jensen, M., et al. (SAIC, Battelle, Mitretek, and Volpe)

Published By: Federal Highway Administration, U.S. DOT

Prepared by SAIC for the U.S. DOT

Source Date: 30 May 2000

EDL Number: 13071

Other Reference Number: Report No. FHWA-OP-00-019

URL: https://rosap.ntl.bts.gov/view/dot/2943

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Benefits From This Source

A model determined that incorporating arterial traffic flow data into the traveler information system in Seattle, Washington could decrease the number of stops by 5.6 percent.

A model found that coordinating fixed signal timing plans along congested arterial corridors leading into Seattle, Washington would help reduce the number of expected crashes by 2.5 percent and the frequency of fatal crashes by 1.1 percent.

Modeling indicated that coordinating fixed signal timing plans along congested arterial corridors leading into Seattle, Washington, and incorporating arterial traffic flow data into the traveler information system would reduce vehicle delay by 7 percent and 1.8 percent, respectively.

Simulation results indicated that vehicle emissions could be reduced by two percent if arterial traffic flow data were included in the traveler information system in Seattle, Washington.

Users of the Advanced Traveler Information System in Seattle, Washington were satisfied with the information on freeway and transit conditions provided via Web sites and a Traffic TV service.

Costs From This Source

An advanced parking information system was deployed as part of the Seattle Metropolitan Model Deployment Initiative for $925,000; maintenance costs of the system hardware were estimated at 7% of the hardware capital costs.

Bus tracking capability was added to the Metro Online Web site as part of the Seattle Metropolitan Model Deployment Initiative at a cost of $333,000.

Nineteen metropolitan North Seattle, Washington city signal systems were integrated at a cost of $1,755,000.

Software development was the key cost driver for the bus arrival and departure information system deployed as part of the Seattle Metropolitan Model Deployment Initiative.

The total capital cost of the Seattle MMDI emergency operations centers project including equipment and planning/development costs were $151,700; O&M costs were approximately 5% of the equipment costs.

Lessons From This Source

Develop long-range plans to ensure the success and continuity of advanced traveler information systems.

Involve the private sector in the implementation of multiple advanced traveler information technologies.

Use an appropriate procurement mechanism to support the implementation of multiple advanced traveler information technologies.

Goal Areas

Mobility

Typical Deployment Locations

Metropolitan Areas

Keywords

CCTV, closed circuit television cameras, road monitoring, sensors, vehicle detector, traffic detection, traffic monitoring, congestion monitoring, coordinated signals, signal coordination, centralized signal control, signal synchronization, traffic signals, advanced signal control, signal timing optimization, coordinated signal control, advanced signal controller, traffic signal retiming, retiming, pre-timed, pretimed, time-of-day signal timing, fixed-time

Benefit ID: 2000-00149