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 Systems||Central Control Signal Coordination|
|Emergency Vehicle Signal Preemption|
|Transit Vehicle Signal Priority|
|Freeway Management Systems||Central Control Ramping Metering|
|Transit Management||Fixed-Route Automated Scheduling and Automatic Vehicle Location|
|Fixed-Route Security Systems|
|Electronic Transit Fare Payment|
|Incident Management Systems||Incident Detection, Verification, Response, and Management|
|Emergency Management Systems||Emergency Vehicle Control Service|
|Emergency Vehicle AVL|
|Traveler Information||Phone- and Web-Based Traveler Information System|
|Kiosk-Based Traveler Information|
|Highway Advisory Radio|
|Dynamic Message Signs|
|Crash Prevention and Safety||Railroad Crossing Monitoring Systems|
|Commercial Vehicle Operations||Weigh-in-Motion and Safety Information Exchange|
|Combination Screening and Clearance|
|Supporting Deployment||Traffic Management Center|
|Transit Management Center|
|Information Service Provider Center|
|Closed Circuit TV and Loop Detectors|
- By lessening congestion and smoothing traffic flows, the ITS deployment resulted in the elimination of more than seven crashes per day in the Seattle area.
- The deployment of incident and emergency management systems, which minimize response time to crashes, also led to a reduction in the severity of crashes.
- Overall, fatal crashes decreased by more than 8 percent, while injury and property damage crashes were reduced by approximately 3 percent. In the course of a year, this safety improvement would result in the avoidance of approximately 20 fatal crashes, 770 injury crashes, and 1,050 property damage crashes in the Seattle area.
Federal Highway Administration
ITS Joint Program Office