Special_Provision_-_M.16.08.pdf
PDF 191 KB Posted
- Solicitation number
- 23/24-11
- Issued by
- Hartford County, Connecticut
About this file
This document is a Special Provision specification for Rectangular Rapid Flashing Beacon (RRFB) Pedestrian Push Button components, issued by the Town of Manchester, Connecticut. The specification provides detailed technical requirements for pedestrian push button systems used with Rectangular Rapid Flashing Beacons, including comprehensive guidelines for design, functionality, accessibility, and construction. The document specifies technical requirements across five key sections: General Features, Audible Pushbutton Locator Tone, Tactile Arrow Pushbutton, Housing, and Painting.
The technical specification mandates that the push button must be ADA compliant, tamper-proof, vandal-proof, weatherproof, and impact-resistant. Key technical details include a circular button with a minimum 2.0" diameter, specific audible tone characteristics with automatic volume adjustment, a tactile arrow with precise dimensional requirements, a die-cast aluminum housing designed to attach to advisory signs, and a three-coat painting process using specific primer, gray enamel, and yellow exterior baking enamel. The specification is highly detailed, ensuring the push button meets strict performance, safety, and accessibility standards for pedestrian crossing controls.
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Text version
Rev. Date 10/29/2020
Rectangular Rapid Flashing Beacon
M.16.08
M.16.08
Article M.16.08 - Pedestrian Push Button:
For RRFB (Rectangular Rapid Flashing Beacon):
Delete the entire section and replace with the following:
A. General
Size and force compliant with ADA, Section 14.2.5, Crossing Controls.
Tamper-proof, and Vandal-proof, Weatherproof, Freeze-proof, Impact-resistant design and construction.
Completely insulated to preclude electrical shock under any weather conditions.
Wire entrance through the rear.
Stainless steel mounting hardware.
Any features in conflict with this spec and MUTCD shall be disabled.
Accessible features shall:
o conform to the MUTCD o provide the speech message “yellow lights are flashing” that shall be spoken twice o include tactile arrow on the button o include a locator tone o not use vibrotactile indications or percussive indications for the audible information
The vibrotactile feedback shall be disabled.
B. Audible Pushbutton Locator Tone
Frequency: repeating tone at one (1) second intervals Tone duration: ≤ 0.15 seconds Volume:
o Minimum setting of zero o Manually adjustable initial setting o Automatically adjusted after initial setting. Volume increased in response to a temporary increase in ambient noise and subsequently decreased with a decrease in ambient noise.
o Maximum volume: 100 dBA which is the approximate sound pressure of a gasoline powered lawn mower nearby.
o Automatic volume adjustment independent of other APS&Ds at the intersection.
o Should not be disabled but have the capability of being disabled without affecting operation of other features.
Silent only when RRFB yellow lights are flashing. Active all other times.
C. Tactile Arrow Pushbutton:
Pushbutton contained in a circular assembly which fits inside the housing and is attached to the housing with 4 screws.
The confirmation light shall flash simultaneously with the RRFB indications.
ADA compliant: Size: ≥ 2.0” diameter, Actuation force: ≤ 5 ft-lb Shape: Circular, raised slightly above housing so that it may be actuated with the back of a hand Tamper-proof, vandal-proof, weatherproof, freeze-proof, impact-resistant design and construction.
https://mutcd.fhwa.dot.gov/resources/interim_approval/ia21/index.htm
Rev. Date 10/29/2020
Rectangular Rapid Flashing Beacon
M.16.08
Tactile Arrow:
o Attached to surface of the button assembly by a tamperproof method.
o Raised slightly above surface of pushbutton, minimum 0.125” o Size: Length ≥ 1.5”, Height ≥ 1.0” o Color: Sharp contrast to background color of pushbutton and housing
D. Housing
Die cast aluminum meeting requirements of ASTM B85.
Designed to attach 9" x 12" four-hole advisory sign.
Flat back to facilitate surface mount.
Available hardware to either pedestal top-mount or pole side-mount on diameter range of
3½" to 15".
Available extension bracket of a size indicated on the plan – 18” maximum.
E. Painting
All Surfaces of the unit shall be finished with 3 coats of infrared oven-baked paint, before assembly.
o First coat: Primer shall be epon-oxide baking primer and shall meet and exceed 1 performance specification of FS TT-P-664.
o Second coat: Gray Enamel shall be lusterless and shall meet the requirements of FS
TT-E-527.
o Third coat: The housing, all brackets, and hardware shall be YELLOW exterior-baking enamel and shall meet the requirements of FS TT-E-489. The color shall be No. 13538, Federal Standard No. 595.
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