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9-29.13(6) Emergency Preemption <br /> Section 9-29.13(6) is supplemented with the following: <br /> 9-29.13(6) Preemption: <br /> The system shall be capable of preempting the controller to the phases shown in the Plans <br /> when a signal is received from the field detector. <br /> Pre-emption equipment shall be either Opticom. <br /> Opticom <br /> If Opticom pre-emption equipment is used, the Contractor shall furnish and install the following: <br /> 1. Pre-emption detectors shall be Opticom Model 711. <br /> 2. Discriminators shall be four-channel model 454 units. One is required at each controller. <br /> In addition, where auxiliary Opticom pre-emption is used, the Contractor shall furnish <br /> and install the following: <br /> 3. A 757 auxiliary optical detector wiringharness where more than one detector is called for <br /> per channel. <br /> 4. A twelve position terminal block of the barrier type rated for 20A at 600 volts RMS <br /> minimum and meeting the requirements of Chapter 11 of the Type 170 Hardware <br /> Specification, FHWA IP-78-16 as currently amended. <br /> 9-29.13(10)C Adaptor Box <br /> ***To Be Determined if Needed*** <br /> The adaptor box shall be fabricated from .125-inch aluminum (5052 alloy), with mill finish. The <br /> cabinet shall not be anodized and the exterior shall not be painted. <br /> The Contractor shall verify foundation and cabinet dimensions and mounting bolt patterns prior <br /> to submitting shop drawings for the adaptor box to the Engineer. The shop drawings shall be <br /> submitted for approval 10 working days in advance of fabrication. <br /> The new controller cabinet, if Contracting Agency-supplied, will be available for bolt pattern <br /> verification as identified under the subsection, Contracting Agency-Supplied Materials of this <br /> provision. <br /> 9-29.15 Flashing Beacon Control <br /> Section 9-29.15 is supplemented with the following: <br /> Solid State Flasher <br /> The solid state flasher shall provide two output circuits to permit alternate flashing of signal <br /> faces. The flash rate shall be 55 flashes per minute ±10%. Duty cycle for each circuit shall be <br /> 50% on, 50% off±2%. <br /> Swift Green Line—Corridor Stations Special Provisions SP212 <br /> May 2017 <br />