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<br />(B) Detector: The detector is positioned in or near the intersection <br />and receives a coded optical communication from the emitter and transmits a signal <br />to the phase selector located on the traffic controller cabinet. <br /> <br />(C) Processor: This unit processes the signal from the detector and <br />places a pre-emption input into the traffic signal controller. The traffic controller can <br />either hold an existing green or advance to the green for the approaching <br />emergency vehicle. <br /> <br />(D) Equipment Uparades: Any required upgrades or replacements <br />of the existing signal control equipment, as determined by the Commission, shall be <br />provided and installed by the City utilizing an electrical signal contractor acceptable <br />to the Commission. <br /> <br />(3) SYSTEM INSTALLATION: The installation of the pre-emption system <br />will be performed by a qualified electrical contractor approved by the Commission. <br />All costs for materials (including cables and connectors), installation and <br />modification to the existing traffic controller will be borne by the Commission. The <br />Commission will prepare plans for the construction of the pre-emption system for <br />review and approval by the Commission. Approval of said plans is within the sole <br />discretion of the Commission. The Commission will be obligated to have the <br />equipment installed in a box external to the Commission traffic signal controller <br />cabinet as determined by the Commission. This external cabinet must be waterproof <br />and all wiring from this box to the traffic controller must be contained in a 1 ~-inch <br />water-tight conduit. The Commission will provide the pre-emption equipment cabinet <br />AC power from the lower side of the traffic signal controller cabinet circuit breaker <br />and the power cable shall be an extension cord grade cable with a minimum of 3 <br />each #16 AWG copper wire. Power from the traffic signal controller cabinet must <br />terminate to a circuit breaker, not rated for more than (10) amperes, located in the <br />pre-emption equipment cabinet. The Commission will determine if the Commission's <br />signal conduits are capable of accepting the pre-emption cables needed at each <br />intersection. The Commission will provide known conduit routing, size of conduit <br />and existing number of cables in conduit. The Commission will provide and install <br />any required "0" connector harness and interface panel in the signal control cabinet <br />for acceptance of the pre-emption detection output signal. The detection output <br />signal will be electrically isolated by a relay with dry contact closure. The mounting <br />of the emitter/receiver to the signal mast arm/signal mast shall be by a waterproof <br />connection. An inspector from the Commission's signal shop may be present during <br />all work to install pre-emption at each intersection. <br /> <br />(4) SYSTEM OPERATION: The City will provide the total number of <br />emitters to the Commission for approval in writing. If or when any additional emitters <br />are added to emergency vehicles, the City will notify the Commission of the change <br />in writing. All emitters on emergency vehicles must have an automatic shutoff so <br />that when the vehicle arrives at the scene it will terminate the signal from the emitter. <br /> <br />2 <br />