Division 13-16-003
Signal Equipment

Sections:

13-16-003-0001    Required/Approved Product List

13-16-003-0002    Controller Cabinet

13-16-003-0003    Electrical Service Cabinet

13-16-003-0004    Uninterruptable Power Supply System

13-16-003-0005    Pull Boxes

13-16-003-0006    Traffic Signal Mounting Assemblies

13-16-003-0007    Traffic Signal Heads and Indications

13-16-003-0008    Pedestrian Signals

13-16-003-0009    Painting of Traffic Signals

13-16-003-0010    Detection Systems

13-16-003-0001 Required/Approved Product List

The City Traffic Engineer maintains a list of traffic signal components and products that are either required to be used, or that are pre-approved for use in City of Flagstaff traffic signals. This list is updated as new products and technologies come onto the market. Because of communication, compatibility, and inventory concerns, certain components are specified by manufacturer and model. Alternatives to these components will not be accepted in new signal installations. Additional components are also specified by manufacturer and model. Submittal of components for approval as "equal" to items on the list may require the submittal of additional information or product samples for testing and review before acceptance in a specific signal design. (Ord. 2017-22, Rep&ReEn, 07/05/2017)

13-16-003-0002 Controller Cabinet

A.    Cabinet shall be NEMA TS2, Type One design with all inputs and outputs through BIU interface. The back panel shall include sixteen (16) load switch bays.

B.    The signal cabinet shall be unpainted aluminum, and provided with and mounted on a sixteen (16) inch high aluminum elevator base.

C.    The cabinet shall include a vehicle detection rack to accommodate sixteen (16) channels of detection.

D.    The cabinet shall include a telemetry interface.

E.    The cabinet shall provide mounting for four (4) channels of 3M Opticom preemption.

F.    The cabinet shall include a GPS based time clock with digital display, which can supply a momentary dry relay closure to the controller programmable for any half (1/2) hour of the day. (Ord. 2017-22, Rep&ReEn, 07/05/2017)

13-16-003-0003 Electrical Service Cabinet

A.    Electrical Service Cabinet.

1.    Shall be a pedestal type, mounted separate from the traffic signal cabinet unless otherwise specified.

2.    Shall provide metered numbers 120/240 vac power for signal and lighting loads.

3.    Shall include a one hundred (100) amp main disconnect for all underground service conductors.

4.    Shall provide space for a minimum of eight (8) one (1) inch circuit breakers.

5.    Shall be of sufficient size to permit three (3) two (2) inch conduits to enter the customer section of the enclosure.

6.    The electrical service cabinet may be combined with the UPS system cabinet and equipment. (Ord. 2017-22, Rep&ReEn, 07/05/2017)

13-16-003-0004 Uninterruptable Power Supply System

A traffic signal UPS system shall be supplied. The UPS system shall include four (4) batteries of sufficient amp-hour rating to support the continuous full operation of a traffic signal drawing one thousand (1,000) watts for a minimum of four (4) hours; the UPS shall not operate the street lighting. The transfer switch shall be manually operated and accommodate the removal of the system control unit and batteries while the signal is operating on line power. The UPS system shall include provisions for generator operation on a signal including a utility acceptable knife type transfer switch and a NEMA Type L14-30R cord inlet with a walkable cover. (Ord. 2017-22, Rep&ReEn, 07/05/2017)

13-16-003-0005 Pull Boxes

Only polymer concrete fiberglass reinforced pull boxes, lids and extensions shall be installed. Pull box lids will be marked "Traffic Signal." (Ord. 2017-22, Rep&ReEn, 07/05/2017)

13-16-003-0006 Traffic Signal Mounting Assemblies

A.    All mounting assemblies shall be ADOT standard types, manufactured of bronze.

B.    All mounting hardware shall have cast serrations. Serrated locking rings will not be permitted.

C.    ADOT Type II mounts will be used for all overhead signals. Type I mounts will not be permitted. (Ord. 2017-22, Rep&ReEn, 07/05/2017)

13-16-003-0007 Traffic Signal Heads and Indications

A.    All signal heads shall be shipped fully assembled. Back plates and visors may be packaged and shipped separately for field installation.

B.    All signal head back plates shall be made from one (1) piece of anodized flat black sixteen (16) gauge aluminum sheet having a nonlouvered, five (5) inch border.

C.    All vehicle signals indications shall be light emitting diode (LED modules, which meet the requirements of ITE VTCSH Standards. (Ord. 2017-22, Rep&ReEn, 07/05/2017)

13-16-003-0008 Pedestrian Signals

All pedestrian signal indications shall be LED countdown type unless otherwise specified. Modules shall have filled, not outlined hand and man displays. Modules shall meet the requirements of ITE VTCSH Standards. (Ord. 2017-22, Rep&ReEn, 07/05/2017)

13-16-003-0009 Painting and Traffic Signals

A.    All metal surfaces of traffic signal heads, pedestrian signal heads, push button assemblies and mounting framework shall be pre-treated and electrostatically power coated flat black.

B.    All traffic signal poles, signal mast arms, luminaire mast arms, and luminaire housings shall be painted Sherwin Williams Drylac RAL6012 or approved equal. Alternative colors may be accepted if approved by the City Engineer.

C.    Prior to painting, poles and mast arms shall be galvanized inside and out. The surfaces to be painted shall be acid washed and cleaned prior to painting. Galvanized coatings on surfaces not being painted shall be protected from the acid wash.

D.    Luminaire housings shall be painted in accordance with ADOT Standard Specifications, Sections 610 and 1002. (Ord. 2017-22, Rep&ReEn, 07/05/2017)

13-16-003-0010 Detection Systems

A.    A complete traffic signal video detection system shall be installed for vehicle detection.

1.    A complete system for modifications to existing signalized intersections utilizing NEMA TS1 cabinets shall include cameras, housing (with lens heater), mounting assemblies, cables and fittings, individually fused power supplies for each camera, video processor modules, interface to NEMA TS2-Type 1 controller, and a twelve (12) inch black and white monitor for each signal.

2.    A complete traffic signal video detection system for NEMA TS2 installations shall include:

a.    A system architecture that fully supports Ethernet networking of system components through a variety of industry standard and commercially available infrastructures that are used in the traffic industry. The data communications shall support direct connect, [modem,] and multi-drop interconnects. Simple, standard Ethernet wiring shall be supported to minimize overall system cost and improve reliability, utilizing existing infrastructure and ease of system installation and maintenance. Both streaming video and data communications shall optionally be interconnected over long distances through fiber optic, microwave, or other commonly used digital communications transport configurations.

b.    A system network software application side integrated through a client-server relationship. A communications server application shall provide the data communications interface between as few as one (1) to as many as hundreds of machine vision processor (MVP) sensors and a number of client applications. The client applications shall either be hosted on the same PC as the communications server or may be distributed over a local area network of PCs using the industry standard TCP/IP network protocol. Multiple client applications shall execute simultaneously on the same host or multiple hosts, depending on the network configuration. Additionally, a web-browser interface shall allow use of industry standard Internet web browsers to connect to MVP sensors for setup, maintenance, and playing digital streaming video.

c.    Video system hardware shall consist of three (3) components: (1) a color, 22x zoom, MVP sensor, (2) a modular cabinet interface unit, (3) a communication interface panel. Additionally, an optional personal computer (PC) shall host the server and client applications that are used to program and monitor the system components. The real-time performance shall be observed by viewing the video output from the sensor with overlaid flashing detectors to indicate the current detection state (on/off). The MVP sensor shall optionally store cumulative traffic statistics internally in nonvolatile memory for later retrieval and analysis.

(1)    The MVP shall communicate to the modular cabinet interface unit via the communications interface panel and the software applications using the industry standard TCP/IP network protocol. The MVP shall have a built-in, Ethernet-ready, Internet Protocol (IP) address and shall be addressable with no plug in devices or converters required. The MVP shall provide standard MPEG-4 streaming digital video. Achievable frame rates shall vary from five (5) to thirty (30) frames/sec as a function of video quality and available bandwidth. The MVP sensor embedded software shall incorporate multiple applications that perform a variety of diagnostic, installation, fault tolerant operations, data communications, digital video streaming, and vehicle detection processing. The detection shall be reliable, consistent, and perform under all weather, lighting, and traffic congestion levels. An embedded web server shall permit standard Internet browsers to connect and perform basic configuration, maintenance, and video streaming services.

(2)    There shall be a suite of client applications that reside on the host client/server PC. The applications shall execute under Microsoft Windows XP, Vista or Windows 7. Available client applications shall include the following: master network browser, configuration setup, operation log, software install, streaming video player, data retrieval, and communications server functions.

(3)    The modular cabinet interface unit shall communicate directly with up to eight (8) MVP sensors and shall comply with the form factor and electrical characteristics to plug directly into a NEMA type C or D detector rack providing up to thirty-two (32) inputs and sixty-four (64) outputs or a one hundred seventy (170) input file rack providing up to sixteen (16) contact closure inputs and twenty-four (24) contact closure outputs to a traffic signal controller.

(4)    The communication interface panel shall provide four (4) sets of three (3) electrical terminations for three (3) wire power cables for up to eight (8) MVP sensors that may be mounted on a pole or mast arm with a traffic signal cabinet or junction box. The communication interface panel shall provide high-energy transient protection to electrically protect the modular cabinet interface unit and connected MVP sensors. The communications interface panel shall provide single-point Ethernet connectivity via RJ45 connector for communication to and between the modular cabinet interface module and the MVP sensor.

B.    The City Traffic Engineering Section may require the installation of inductive loop detectors, due to special conditions.

1.    All inductive presence detection loops shall be quadrupole design.

2.    Preformed loop detectors are preferred, however, cut in place loops shall be considered when appropriate.

3.    Standard loop configuration shall be:

a.    Left turn lanes require a six (6) by forty (40) front loop and a six (6) by twenty (20) rear loop separated by twelve (12) feet.

b.    Through and right turn lanes require a six (6) by fifty (50) loop.

c.    Bike lanes require a three (3) by ten (10) loop.

d.    High-speed approaches may require one (1) more six (6) by six (6) square advance extension loops per lane.

4.    Loop detector amplifiers shall be two (2) channel units with programmable extension and delay timing.

C.    Pedestrian push button stations shall be ADOT Type 2 design and shall be ADA compliant. Buttons shall utilize PEIZO-electric switching and provide visual and audible indications of activation.

D.    Single channel dual detection Global Traffic Technologies Opticom EVP detectors shall be installed on all approaches. Detectors shall be installed on a band-on mounting bracket. GTT Opticom cable shall be utilized. (Ord. 2017-22, Rep&ReEn, 07/05/2017)