System Architecture that Supports Interoperability Between Intelligent Transportation Centers 2002-01-2141
A major area of emphasis in Intelligent Transportation Systems (ITS) funding initiative is the interoperability between centers. During the 1990s, emphasis was on upgrading arterial traffic operations centers and deploying centers to manage major state corridors. Additionally, there was an emphasis to bring automated vehicle location (AVL) and computer- aided dispatching (CAD) technology into transit and emergency management centers. Now that core ITS infrastructure is deployed, achieving interoperability between ITS centers is a major priority of the Federal, state jurisdictions.
This paper presents the design of the I-580 Smart Corridor Intelligent Transportation System. This project focused on the Tri-Valley area, located in Alameda County, California. A number of jurisdictions participated in the project including Caltrans District 4, California Highway Patrol (CHP), Alameda County, the City of Pleasanton, the City of Livermore, the City of Dublin, and the two transit agencies serving the area; BART and LAVTA. This project is currently in a construction and testing phase. It represents one of the first projects where a number of centers were designed utilizing a common architecture and it was procured as a single program. Because the centers were designed together, capability to interoperate with other Tri-Valley ITS centers was incorporated. A Tri-Valley ITS Optical network was included in the design, supporting multimedia communications between centers.
The I-580 Smart Corridor Project incorporates key ITS standards including NTCIP field devices-to-center protocol and NTCIP center-to-center protocol. The design also included ATSC digital television standards deployment, allowing centers to share closed circuit television video. Additionally incorporated into the design is the Tri-Valley traveler information Internet web site which provides information to travelers on priority corridor congestion, video images of corridor congestion, and access to public transit information.
Also discussed in this paper are new field devices integrated with the centers. This project includes the deployment of low power consumption traffic signal devices and an uninterruptible power system (UPS) at the traffic controller to support continued operations with loss of commercial power. Due to the major power problems encountered in California during 2001, the uninteruptable power systems are being deployed on major corridors to minimize traffic problems during major commercial power outages.
Consensus building between jurisdictional representatives was a major achievement, allowing the project to move forward with a common architecture and procurement. This paper discusses techniques utilized to develop consensus as well as lessons learned during the project.