645Pedestrian Detection Assemblies

645.01 Description. This work consists of furnishing Pedestrian Detection Assemblies

of the type specified and installing them in accordance with these specifications and the details shown on the plans or as directed by the Engineer. Pedestrian Detection Systems are classified in two (2) categories: Standard Pedestrian Pushbutton Detection Systems and Accessible Pedestrian Pushbutton Detection Sy stems. A Pedestrian Detection System consists of the following principal components: Pushbuttons, Pedestrian Actuation Signs, electronics, wiring, and mounting hardware. The function intended for use with these systems include Pedestrian Detection.

645.02 Materials.

645.02.1 Standard Pedestrian Pushbutton Detector. Pushbuttons shall be raised from

or flush with their housings and be a minimum of two (2) inches in the smallest dimension. The Pushbutton shall require no more than five pounds (5 lbs.) of force to activate. The detector shall be weather-tight and tamper re sistant. The pushbutton shall be provided complete with suitable mounting hardware for banding, or attaching by other suitable methods, to poles.

645.02.1 1--Housing. The housing shall be a two (2) piece unit consisting of a base

housing and a removable cover. The housing shall be cast metal with a brushed aluminum finish and shall be primed and painted black in color. The housing shall be rain-tight, weatherproof, and shall protect users from elect rical shock. The housing or adapter shall conform to the shape of a pole and provide a flush, secure fit. Unused openings shall be closed with a weatherproof closure and painted to match the housing. The housing shall be permanently marked with the Manufacturer name or trademark, part number, date of manufacture, and serial number.

645.02.1 2--Pushbutton. The Pushbutton shall include a normally-open, mechanical

phenolic enclosed, positive-acting, snap-action switch with signal pole, single throw contacts or Piezo driven solid state switch rated for a minimum of 50 V. The switch, when activated, shall give an audible (i.e., click) or visual indication of actuation. Switch connections inside the housing shall allow wiring and installation without binding. The switch shall have a minimum design life of one (1) million operations at rated load.

645.02.1 3--Electrical Requirements. The cabling, at a minimum, shall be AWG 14, 5-

Conductor stranded with 600 V outdoor insulation rating.

645.02.1 4--Control Electronics. Control electronics shall not require more than four (4)

wires for each Pushbutton connection, and no more than two (2) wires for each controller pedestrian input. Voltage at the Pushbutton shall not exceed 24 VAC.

645.02.2 Accessible Pedestrian Pushbutton Detector. The Accessible Pedestrian

Pushbutton Detector shall be MUTCD, latest edition, compliant and consist of all electronic control equipment, wiring, mounting hardware, pushbuttons, and Pedestrian Actuation Signs designed to provide both a pushbutton with a raised, vibrating tactile arrow on the button as well as a variety of audible indications for differing pedestrian signal functions.

645.02.2 1--Electronic Control Equipment. The Accessible Pedestrian Pushbutton

Detector shall include electroni c control equipment that is programmable and adjustable using a laptop computer or vendor supplied programmer. Electronic control equipment shall be able to be installed within a traffic controller cabinet or within Pedestrian Signal housing. Electronic control equipment installed within a traffic controller cabinet shall allow the use of up to 16 pushbuttons (four (4) maximum per channel) with a single traffic controller cabinet. The Accessible Pedestri an Pushbutton Detector shall receive timing from WALK and DON’T WALK signals.

645.02.2 1.1--Audible Messages. Audible messages shall be programmable. All audible

messages and tones shall emanate from the Accessible Pedestrian Pushbutton housing. The Accessible Pedestrian Pushbutton Detector shall utilize digital audio technology. The system shall have, at a minimum, three (3) programmable locator tones. The Accessible Pedestrian Pushbutton Detector shall have independent minimum and maximum volume limits for the Locator Tone, “Walk,” and Audible Beaconing features. The “Wait” message shall only annunciate once per actuation.

645.02.2 1.2--Pushbutton Locator Tone. The Accessible Pedestrian Pushbutton Detector

shall provide independent ambient sound adjustment for the locator tone feature. The Accessible Pedestrian Pushbutton Detector shall allow the locator tone to be deactivated.

645.02.2 1.3--Vibrating Pushbutton (VPB). The Accessible Pedestrian Pushbutton

Detector shall include a Vibrating Pushbutton (VPB). The VPB shall be a single assembly containing an ADA compliant, vibro-tactile , directional arrow button, weatherproof audible speaker and pedestrian actuation sign with optional placard Braille messages. The VPB tactile arrow shall be two (2) inches in length, be field adjustable to two (2) directions, and require no more than five pounds (5 lbs.) of applied force to activate.

645.02.2 1.4--Conflict Monitoring. The Accessible Pedestrian Pushbutton Detector shall

monitor the WALK condition for conflict operation. The Accessible Pedestrian Detector system shall disable the WALK functionality if a conflict is detected.

645.02.2 1.5--Cabinet Control Unit (CCU ). The Accessible Pedestrian Pushbutton

Detector may include a CCU for interfacing and connecting the system. The CCU shall have labeled LED indicators for each channel operation. The CCU shall reset upon loss of internal communication.

645.02.2 2--Inputs and Outputs. All inputs and outputs shall use Mil-Spec Multi-pin

connectors.

645.02.2 2.1--Inputs. WALK and DONT WALK inputs shall be optically isolated 80-150

volts AC/DC, five (5) mA max. General purpose inputs shall be optically isolated 10-36 volts AC/DC, ten (10) mA max.

645.02.2 2.2--Outputs. Outputs shall be optically isolated 36 volts AC/DC peak, 300mA

solid state fused contact closures. CCUs shall include a normally open relay contact fault output.

645.02.2 3--Communication. The CCU shall include an Ethernet interface. The CCU

shall have an integral web server that provi des information on audible/tactile pedestrian- pushbutton detector status, access to event logs, and provides for remote configuration of Accessible Pedestrian Pushbutton Detector System options. VPBs shall include an Ethernet, serial, or USB programming interface.

645.02.3 Electrical. All wiring shall meet applicable NEC requirements. The Accessible

Pedestrian Pushbutton Detector shall operate using a nominal input voltage of 120 volts alternating current (VAC). If any device requires nominal input voltage of less than 120 VAC, furnish the appropriate voltage converter. Accessible Pedestrian Pushbutton Detector control electronics that are mounted in a pedestrian signal head shall be able to receive power from the WALK and DONT WALK circuits of the signal head. Control electronics shall not require more than four (4) wires for each pushbutton connection, and no more than two (2) wires for each controller pedestrian input. Voltage at the Pushbutton shall not exceed 24 VAC.

645.02.4 Mechanical. Equipment shall be permanently marked with manufacturer name

or trademark, part number, date of manufactu re, and serial number. Self-tapping screws shall not be used on the exterior of the assembly. All parts shall be made of corrosion-resistant materials. All assembly hardware, including nuts, bolts, external screws and locking washers less than 5/8 inch in diameter, shall be Type 304 or 316 passivated stainless steel. Stainless steel bolts, screws and studs shall meet ASTM F593. Nuts shall meet ASTM F594 . All assembly hardware greater than or equal to 5/8 inch in diameter shall be galvanized. Bolts, studs, and threaded rod shall meet ASTM A307. Structural bolts shall meet ASTM A325. Enclosures shall have a NEMA 4X rating. Pushbutton housings shall be black in color.

645.02.5 Environmental. Ensure equipment performs all required functions during and

after being subjected to the environmental testing procedures described in NEMA TS2, Sections 2.2.7, 2.2.8, and 2.2.9.

645.03 Construction Requirements. The installation shall be carried out in

conformance with the requirements herein stated and shown on the plans, and shall present a neat and workmanlike appearance. The Pedestrian Detection Assemblies shall be mounted on the traffic signal or pedestal poles and connected to the detector wiring as indicated on the plans and as required in these specifications. The height of the assemblies shall be based on the final grade of the completed project.

645.04 Method of Measurement. Pedestrian Detection Assemblies of the type specified

will be measured as a unit per each.

645.05 Basis of Payment. Pedestrian Detection Assemblies, measured as prescribed

above, will be paid for at the contract unit price per each, which price shall be full compensation for furnishing the housing, pushbutton, electronic control equipment, programmed audible messages and tones, mounting attachments, sockets, socket wiring, and all other materials; for installing, mounting, connecting, aligning, testing, equipment, labor, tools, and all incidentals necessary to complete the work. Payment will be made under: 645-A: Standard Pedestrian Detection Assembly - per each 645-B: Accessible Pedestrian Detection Assembly - per each