Full deployment of comprehensive ITS strategies in Seattle are projected to reduce CO, HC, and NOx emissions by 16 percent, 17 percent and 21 percent, respectively and reduce fuel consumption by 19 percent.

The projected results of full ITS deployment in a large metropolitan area.

May 2005
Seattle,Washington,United States

Summary Information

The Federal Highway Administration initiated a study to explore the benefits and costs of fully deploying operational strategies and integrating ITS in the large metropolitan area of Seattle. The strategies included in Seattle's Full Operations and ITS Deployment Scenario were identified by consulting with local agencies to identify the overall ITS program planned through the next 25 years. The benefits are contingent on complete deployment of the full operations and ITS deployment scenario. The selected strategies are listed in the following table.

Arterial Traffic Management SystemsCentral Control Signal Coordination
Emergency Vehicle Signal Preemption
Transit Vehicle Signal Priority
Freeway Management SystemsCentral Control Ramping Metering
Transit ManagementFixed-Route Automated Scheduling and Automatic Vehicle Location
Fixed-Route Security Systems
Electronic Transit Fare Payment
Incident Management SystemsIncident Detection, Verification, Response, and Management
Emergency Management SystemsEmergency Vehicle Control Service
Emergency Vehicle AVL
Traveler InformationPhone- and Web-Based Traveler Information System
Kiosk-Based Traveler Information
Highway Advisory Radio
Dynamic Message Signs
Crash Prevention and SafetyRailroad Crossing Monitoring Systems
Commercial Vehicle OperationsWeigh-in-Motion and Safety Information Exchange
Combination Screening and Clearance
Supporting DeploymentTraffic Management Center
Transit Management Center
Emergency Management
Information Service Provider Center
Closed Circuit TV and Loop Detectors

  • The ITS improvements would result in decreased vehicle pollutants and reduced fuel use in the Seattle area.
  • Full deployment would result in a reduction for all emissions analyzed. Carbon monoxide and hydrocarbon emissions were reduced by approximately 16 percent and 17 percent, respectively, while nitrous oxides were reduced by more than 21 percent.
  • Fuel use in the region was cut by more than 1 million gallons per day, a total reduction of more than 19 percent. This represents an average savings of more than 0.1 gallons per trip.

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Benefits and Costs of Full Operations and ITS Deployment: A 2003 Simulation for Seattle

Published By: United States Department of Transportation Federal Highway Administration ITS Joint Program Office

Source Date: May 2005

EDL Number: 13977

Other Reference Number: Report No. FHWA-JPO-04-033


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Typical Deployment Locations

Metropolitan Areas


ramp meters, 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, emissions, fuel consumption, air quality, carbon monoxide, hydrocabons, nitrous oxides

Benefit ID: 2015-01031