and exit to alert motorists of the barrier position. Traffic lights are
not required for manual barriers. The yellow flashing light shall indicate
that the barrier is fully open. All other positions shall cause the light
to show red. Brackets shall be supplied to allow the light to be mounted a
minimum 1.4 m 4.5 feet above the roadway pavement on a 90 mm 3.5 inch
outside diameter metal post [or mounted directly on the crash gate].
2.9.2
Warning Annunciator
Provide a warning annunciator built into the barrier control panel that
produces a pulsing audible sound when the speed loop detects a vehicle
entering the facility with excess speed. Provide a warning annunciator
built into the barrier control panel that produces a continuous sound
whenever a wrong way loop detects a vehicle entering from the exit. The
warning annunciator shall sound until a warning annunciator silence reset
button is pressed.
2.9.3
Heater
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NOTE: Retain or delete paragraph based on climatic
conditions.
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A waterproof barrier heater with a thermostat control and NEMA 4 junction
box connection point shall be provided for de-icing and snow melting. The
heater shall provide barrier operation to an ambient temperature of minus
40 degrees C minus 40 degrees F. For retractable bollards, a 250-watt
heater shall be provided for each bollard.
2.9.4
Signage
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NOTE: Load limit signs based on allowable single
axle loads for highways of 80 kN (18,000 pounds) and
maximum tandem axle loads of 142 kN (32,000 pounds)
are required for subsurface vehicle barriers, except
bollards, at entry control points (ECPs). Signage
shall conform to FHWA SA-89-006.
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Signage shall read "Axle Weight Limit 9 Tons" and shall conform to FHWA
SA-89-006 sign (R12.2).
2.9.5
Vertical Arm Gates (Traffic Arms)
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NOTE: Edit the traffic arm location based on design
requirements.
**************************************************************************
Vertical arm gates shall have an opening and closing time of less than or
equal to 5 seconds. The gates shall be capable of 500 duty cycles per hour
as a minimum. Gate shall operate the arm through 90 degrees. Gate
operators shall be supplied with single phase 120 volt motors. [Each entry
lane shall be provided with a vertical arm gate.] Each gate shall be
capable of being operated from a remote open-close push button station [in
each guard booth and the gatehouse for the respective entry lane]. Gates
shall have a hand-crank, or other means, which will allow manual operation
SECTION 02840
Page 22
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