A generic depiction of the emergency vehicle preemption and transit signal priority system is provided in Exhibit A. As depicted, a device located on an emergency or transit vehicle communicates with the signal controller within a predetermined distance of the intersection. An emergency vehicle would be provided an “unconditional” green interval (i.e. preemption) in a safe and efficient manner as soon as all other necessary movements are provided a red interval. A transit vehicle would be provided a “conditional” green interval (i.e. priority) only if certain conditions prevail (e.g. no emergency vehicle request has been made and the existing interval in the direction of the transit vehicle is green and thus only a limited, green extension will be provided; if the signal interval in the direction of the transit vehicle is red when the transit priority request is made, the request is ignored).
The emergency vehicle preemption and transit priority system will be installed in the vicinity of one or two (1 or 2) firehouses along U.S. Route 1 where four bus routes also exist. Major participants in the project will include the Virginia Department of Transportation (VDOT), Fairfax County, Virginia Tech, and the Vendor. VDOT maintains the traffic signal system. Fairfax County operates the major firehouses in the corridor and three of the four bus routes. Virginia Tech will be instrumental in conducting the system performance evaluation. The major responsibilities of the Vendor are to provide, install and maintain the system and its components. These responsibilities would be carried out in coordination with VDOT, Fairfax County transportation, fire and rescue officials, and Virginia Tech.
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