DIVISION 58 TRAFFIC SIGNAL
58.01 SCOPE: The contractor shall furnish all materials, equipment and labor necessary to construct the traffic signal as shown on the drawings and specified in the specifications complete and ready for activation. 58.02 MATERIALS: A.
Traffic Signal Mast, Mast Arm, Luminaire Arm and Rigid Signal Mounting Brackets: 1.
General: a.
Each traffic signal strain pole or traffic signal mast arm pole shall be manufactured in accordance with the following specification and any drawings that might be attached hereto and made a part of these specifications.
b.
Traffic signal strain pole or traffic signal mast arm poles shall consist of a tapered steel shaft of the specified length and a diameter at the base as required by the design complete with anchor base, handhole, cast pole cap, anchor bolts and nuts, flange plate for signal mast arm on mast arm poles, flange plate for luminaire arm when required, and all other hardware necessary for installation of the pole and any attachments thereto.
c.
Traffic signal mast arm shall consist of a tapered steel arm of the specified length and size as required by the design complete with mounting flange, removable end cap, all hardware required for the installation of the signal mast arm and supplied with five rubber grommets with a 1 inch inside diameter suitable for field drilled hole 1 3/8 inches in diameter in the side of the arm at the location for each signal.
d.
Castings shall be clean and smooth, with all details well defined and true to pattern. Steel castings shall conform to ASTM A27, Grade 65-35. Gray iron castings shall conform to ASTM A126, Class A.
e.
Traffic signal strain poles and traffic signal mast arm poles with traffic signal mast arm(s), after completely assembled, shall be designed to resist, at yield strength of the material without destruction, at test loads equivalent to the calculated loads developed by velocity pressure of at least 90 MPH wind in accordance Rev. 1/05 58 - 1
AASHTO. Wind pressure shall be calculated assuming 30 foot height above the ground (corrected for actual heights and shapes of the signals and supporting structures), unity drag coefficient, standard air, and a gust factor of 1.3.
f.
1)
The minimum load for a traffic signal strain pole shall be assumed to be two spans of 100 feet at 90 degrees to each other with a three percent sag. Each span shall have a minimum of two 1-way, 3-section traffic signals and one 1way, 5-section (house design) traffic signal at the approximate center of the span, each having 12 inch lens, backplates and spaced 10 feet apart, secured at the bottom by a tether wire. In addition each span shall have a sign of 7.5 square feet (2.5' X 3.0'), mounted 3 feet to the right of the 5section signal head fastened to the tether wire. However, no strain pole shall have less than an O gauge tube, a butt diameter of 12 inches, a bolt circle of 16 inches and a height of 30 feet. Where the intersection design plans show additional traffic signal heads or additional traffic signal heads are specified this shall be the signal load required and shall include the sign stated above. No traffic signal strain pole shall be less than that stated above.
2)
The minimum load for a traffic signal mast arm pole and traffic signal mast arm shall be assumed to be two 1-way, 3section traffic signals and one 1-way, 5-section (house design) traffic signal at the extreme end of the arm, each having 12 inch lens, backplates and rigid mounting, and spaced 10 feet apart. In addition there shall be a rigid mounted sign of 7.5 square feet (2.5' X 3.0') 3 feet from the end and another rigid mounted sign between the 3-section signal heads of 25 square feet (2.5' X 10.0'). Where the intersection design plans show additional signals or additional signals are stated this shall be the signal load required and shall including the two signs stated above. However, no load design shall be less than that stated above.
Traffic signal strain poles, traffic signal mast arm poles and traffic signal mast arms shall be made of only one length of the best grade, hot-rolled, basic open-hearth steel of not less than #7 Manufacturers Standard Gauge. Only one longitudinal weld and no transverse welds shall be permitted in the fabrication of traffic signal poles and traffic signal mast arms. After being formed and welded the pole or mast arm shall then, under sufficient pressure to flatten the longitudinal weld, be formed into a smooth, round tapered tube, and increase its physical characteristics so that the metal will have a guaranteed Rev. 1/05 58 - 2
minimum yield strength of 60,000 psi (ASTM A595, Grade A). Ground smooth welds shall not be acceptable. g.
2.
After all components of the traffic signal pole, traffic signal mast arm pole and traffic signal mast arm have been assembled to make a complete unit they shall be hot-dipped galvanized in accordance with ASTM A123.
Traffic Signal Pole: a.
Traffic signal poles shall conform to ASTM A595, Grade B. The shaft shall be round in cross section with a uniform taper in diameter from base to top of 0.14 inch per foot. Multi sided poles shall not be acceptable.
b.
A reinforced handhole frame, conforming to ASTM A576, complete with handhole cover, conforming to ASTM B209, shall be welded into the shaft above the base proportionately to the butt diameter. The frame shall be drilled and tapped for a ½"-13NC bolt for grounding.
c.
Traffic signal mast arm pole shall have an external flange plate for the signal mast arm that shall be welded to the shaft at a height of 19 feet to the center line above the base and supported with side plates tangent to the pole and gusset plates both top and bottom. The flange plate shall have a deburred 2 ½ inch diameter wiring hole and four holes with high-tensile bolts, nuts, washers and lock washers for mounting the signal mast arm. The mast arm pole shall have a deburred 4 inch diameter hole for wiring directly behind the hole in the mast arm flange plate.
d.
Traffic signal mast arm pole with luminaire arm shall have a reinforced handhole frame (ASTM A576), complete with cover (ASTM B209), which shall be welded into the shaft so as to provide easy access to the signal mast arm for wiring. The handhole shall be a minimum of 3" by 5" in size and shall be similar to that in the base of the shaft. A "J" hook shall be welded inside for wire support.
e.
Traffic signal pole with luminaire arm shall have a flange plate for the luminaire arm welded to the pole so as to provide the proper luminaire mounting height and supported with side plates tangent to the pole and gusset plates both top and bottom. The flange shall have a deburred 2 inch diameter wiring hole and four tapped holes with stainless steel bolts for mounting the luminaire arm. The pole shall have a deburred 2 inch diameter hole for wiring directly behind the hole in the luminaire arm flange plate. Rev. 1/05 58 - 3
3.
f.
Traffic signal pole shall have a "J" hook for wire support welded inside near the top of the shaft.
g.
The top of the traffic signal pole shall have a cast pole cap conforming to ASTM B26 secured in place with set screws.
Anchor Base:
4.
a.
Traffic signal pole shall have a one piece round steel anchor base, conforming to ASTM A36, of sufficient strength, size and thickness and shall be secured to the butt end of the shaft by two continuous electric arc welds. The base shall telescope the shaft, one weld shall be on the inside at the bottom of the shaft while the other weld shall be on the outside at the top of the base. The design shall be such that the welded connection shall develop the full strength of the adjacent shaft section to resist bending action. (1/05)
b.
The round base shall be of the size required and shall be provided with six holes to receive the anchor bolts. The diameter of the anchor bolt holes and the anchor bolt circle shall be determined by the size of the shaft. (1/05)
c.
Six removable cast aluminum covers, conforming to ASTM B26, for the anchor bolts shall be provided with each base. Each cover shall attach to the upright portion of the body of the base by means of a hex head screw. (1/05)
Anchor Bolts: a.
Anchor bolts shall conform to ASTM A36, shall exhibit 85,000 psi ultimate tensile strength and shall have an "L" shaped at the bottom.
b.
Each anchor bolt shall have sufficient thread to allow for two nuts and maximum rake and shall be complete with two nuts conforming to ASTM A563, Grade A. There shall be a regular hex nut on top and a heavy square nut on the bottom for adjusting the rake.
c.
The threaded end to approximately 8 inches below the thread and the two nuts shall be hot-dipped galvanized conforming to ASTM A123.
d.
The diameter and the length of the anchor bolts shall be determined by the size of the pole required for the load.
e.
Six anchor bolts complete with nuts, as described, shall be supplied with each traffic signal pole. (1/05) Rev. 1/05 58 - 4
5.
6.
Signal Mast Arm: a.
The traffic signal mast arm shall conform to ASTM A595, Grade B; shall be round in cross section with a uniform taper in diameter of 0.14 inch per foot from the flange plate to the free end.
b.
The flange plate of a thickness required shall telescope the large end of the arm and be welded by two continuous electric arc welds. One shall be on the outside of the plate adjacent to the arm and the other weld shall be on the inside of the plate at the end of the tubular cross section. The flange plate shall have a deburred 2 ½ inch hole in the center for wiring and four holes to match the four holes in the flange plate on the signal mast arm pole and be complete ready to mount with the required hardware specified with the pole.
c.
A galvanized steel removable cap shall be attached to the end of the arm by a screw.
d.
The traffic signal mast arm shall be field drilled on the bottom for the wire to the signal head. However, for each required signal a rubber grommet with 1 inch inside diameter suitable for the field drilled 1 3/8 inch hole in the side of the mast arm for the signal wire to pass through into the rigid traffic signal mounting bracket shall be supplied. A minimum of five grommets per arm shall be supplied.
e.
The arm and mounting plates shall be designed to provide a ½ inch rise in elevation per foot of arm length when installed.
f.
The traffic signal mast arm shall be positioned 180 degrees with relationship to the handhole at the base of the pole. If any additional arms are attached they shall be referenced to the initial mast arm.
g.
Traffic signal mast arms forty feet in length or greater may be two piece arms. The outer shall telescope the inner piece and they shall be connected by means of not less than a ½ inch galvanized stud bolt and Anco nuts.
Rigid Signal Mounting: a.
The rigid mast arm signal mounting shall consist of a bracket strapped to the signal mast arm by two straps with a vertical tube and signal head mounting arms at the top and bottom.
b.
The strapping holding the bracket to the mast arm shall be stainless steel, a minimum of ½" in width. The bracket and tube shall be aluminum or galvanized steel, the tube shall have a slot in the back with an insert to cover the slot. The signal head mounting arms shall Rev. 1/05 58 - 5
be cast aluminum with the bottom arm allowing the wire to pass through it.
7.
8.
c.
The mast arm bracket, tube and bottom signal mounting arm shall provide for the concealment of the signal cable.
d.
Each traffic signal mast arm shall come complete with rigid mast arm mounting for the size and type of each signal head specified for it.
Rigid Sign Mounting: a.
The rigid mast arm sign mounting shall consist of a bracket strapped to the signal mast arm by two straps with a vertical bracket to hold the 7.5 square foot sign.
b.
The rigid mast arm sign mounting shall consist of a bracket strapped to the signal mast arm by two straps with a vertical sign mounting bracket spaced 24 inches apart, or by a single strap bracket spaced 12 inches apart for the 25 square foot sign. For a 15 square foot (1.5' X 10.0') sign a bracket strapped to the mast arm by a single strap spaced 24 inches apart.
c.
The strapping holding the bracket to the mast arm shall be stainless steel, a minimum of ½" in width. The mast arm bracket and the bracket for mounting the sign shall be aluminum or galvanized steel.
Warranty: The manufacturer, distributor, vendor and contractor shall warrant the shaft(s) complete with base plate and flange plate, signal mast arm(s) complete with flange plate luminaire arm complete with flange plate and all associated hardware to be free from defects in material and workmanship for a period of two (2) years from date of delivery. Any defects within this period shall be repaired or replaced by the manufacturer, distributor or vendor, at total cost to the manufacturer, distributor or vendor, including labor, parts, transportation and installation.
9.
Manufacturer Certification: The contractor shall submit notarized certification from the manufacturer that each and every piece, shaft with anchor base, handhole(s) and flange plate(s), signal mast arm and flange plate, luminaire arm and flange plate, anchor bolts and all associated hardware were manufactured in accordance these specifications and the design specification drawing as submitted by the bidder.
B.
Traffic Signal Heads and Back Plates: Rev. 1/05 58 - 6
1.
LED Traffic Signal Heads: Traffic signal heads shall be ultraviolet stabilized polycarbonate resin, Federal Yellow in color. Each section shall have 12" LED indications and shall be one piece housing, door and visor. The housing to be injection molded with integral top, bottom and sides. The door is to be one piece and grooved to accommodate a neoprene gasket, which makes the signal weatherproof, and dust tight. The color shall be impregnated into the material so it never needs painting, is unaffected by scratches and is impervious to corrosion. For alignment of the signal and assure positive locking each section shall have integral locking rings adjustable in 5 degree steps. Each section shall have ribbing on the top and bottom with additional ribbing on the inside of the housing and reinforcement plates at the top and bottom for stability. All sections shall have cored holes for mounting back plates and all components shall be interchangeable. The sections shall be joined together by the means of a tri-bolt coupling to form the signal head. The signal head shall have a terminal strip with each lamp receptacle connected to a terminal and a common terminal for the neutral lead. The visors shall be flat black on the inside and 9" tunnel style unless otherwise stated. All indications and signal heads shall meet the ITE Specifications. Each signal head shall consist of the required sections as shown on the plans joined together with red, amber, amber arrow, green or green arrow LED indications as specified. Five section "House Design" signal head shall consist of a single section with a red LED indication at the top joined by the use of two way fittings to two 2 section heads, each having an amber or amber arrow LED indications and a green or green arrow LED indications as specified on the plans.
2.
Back Plate: The back plate shall be constructed of a gauge metal to withstand high winds. The back plate shall be so designed that it can be mounted on the main signal housing behind the signal face in a manner not to obstruct the individual door opening. The back plate shall have a flat or dull baked on black finish.
C.
Traffic Control Cabinet: These specifications describe the requirements for Econolite Control Products, Inc., NEMA TS2 1992 Type 1 approach Base Mounted City of Chesapeake Traffic Management System Cabinet. 1.
Base Mounted Cabinet: a.
Size Cabinet to be 26 inches deep; 44 inches wide; height to be a minimum of 55 inches, a maximum of 77 inches as required to house Rev. 1/05 58 - 7
equipment. b.
Construction Cabinet to be constructed of 0.125 inch thick aluminum, natural finish. Thermostatically controlled filtered, forced air fan system with screened air intake opening. Full width main door with continuous main door hinge with stainless steel hinge pin, three point latch and Corbin #2 tumbler lock, police panel access door mounted in upper third of door with standard lock. To have sufficient shelves for required equipment (minimum of three). To be mounted with 4 anchor bolts spaced 18.5 inches by 40.75 inches.
c.
Wired for and Contain the Following Equipment 1)
1 - Power Panel and shall contain: One fifty amp. main circuit breaker One fifteen amp. auxiliary circuit Signal buss relay (mercury relay) Earth and neutral buss bars Radio interference suppressor AC line voltage surge protector (ACP-340) Fused ground fault interrupter duplex outlet Sine-wave tracking protector
2)
1 - Maintenance Panel and shall contain: Controller power on/off switch Auto/Flash switch without stop time with external start features Stop time/Run/Normal switch
3)
1 - Police Panel and shall contain: Signal on/off switch Auto/Manual switch Auto/Flash switch with stop time and external start features
4)
1 - Flex arm lamp with switch
5)
1 - Eight phase, sixteen channel, twelve load switch position load bay
6)
1 - ASC/2S twelve phase controller with telemetry module for communications complete with connecting cables and software capable of communications with the City of Rev. 1/05 58 - 8
Chesapeake (SMART TRAFFIC CENTER ) systems software. 7)
1 - Sixteen channel malfunction management unit (NEMA Std.) with connecting cable
8)
1 - Telemetry interconnect assembly, connecting cable and telemetry panel to detector panel cable
9)
Required number of TS2 loop amplifier detector, two-channel rack mounted, self-tuning with timing function and counting outputs as shown on the plans.
10)
1 - Two circuit flasher
11)
4 - Flash transfer relays
12)
12 - Three circuit load switches
13)
1 - TS2 cabinet power supply
14)
4 - Pedestrian isolation cards
15)
2 - Bus interface unit
16)
Surge protection shall be provided on the terminal strip for the field connection of all loop lead-in cable and interconnect cables
17)
Fiber Optic Modem
18)
Vehicle Identifying Infrared Optical Preemption and Communications System with (4) Sensors
Rev. 1/05 58 - 9
d.
Measurement of Payment This item will not be measured as a separate pay item but will be paid for under the lump sum price for traffic signal shown on the unit price table as traffic signal.
D.
System Cabinet For Use With Video Detection: 1.
Base Mounted Cabinet: a.
Size Cabinet to be 26 inches deep; 44 inches wide; height to be a minimum of 55 inches, a maximum of 77 inches as required to house equipment.
b.
Construction Cabinet to be constructed of 0.125 inch thick aluminum, natural finish. Thermostatically controlled filtered, forced air fan system with screened air intake opening. Full width main door with continuous main door hinge with stainless steel hinge pin, three point latch and Corbin #2 tumbler lock, police panel access door mounted in upper third of door with standard lock. To have sufficient shelves for required equipment (minimum of three). To be mounted with 4 anchor bolts spaced 18.5 inches by 40.75 inches.
c.
Wired For and Contain the Following Equipment 1)
1 - Power Panel and shall contain: One fifty amp. main circuit breaker One fifteen amp. auxiliary circuit Signal buss relay (mercury relay) Earth and neutral buss bars Radio interference suppressor AC line voltage surge protector (ACP-340) Fused ground fault interrupter duplex outlet Sine-wave tracking protector
2)
1 - Maintenance Panel and shall contain: Controller power on/off switch Auto/Flash switch without stop time with external start features Stop time/Run/Normal switch
Rev. 1/05 58 - 10
3)
1 - Police Panel and shall contain: Signal on/off switch Auto/Manual switch Auto/Flash switch with stop time and external start features
4)
1 - Flex arm lamp with switch
5)
1 - Eight phase, sixteen channel, twelve load switch position load bay
6)
1 - ASC/2S twelve phase controller with telemetry module for communications complete with connecting cables and software capable of communications with the City of Chesapeake (SMART TRAFFIC CENTER) systems software.
7)
1 - Sixteen channel malfunction management unit (NEMA Std.) with connecting cable
8)
1 - Telemetry interconnect assembly, connecting cable and telemetry panel to detector panel cable
9)
1 - Two circuit flasher
10)
4 - Flash transfer relays
11)
12 - Three circuit load switches
12)
1 - TS2 cabinet power supply
13)
4 - Pedestrian isolation cards
14)
2 - Bus interface unit
15)
Surge protection shall be provided on the terminal strip for the field connection of all loop lead-in cable and interconnect cables
16)
1 - Autoscope Solo Pro video detection cabinet adder which includes one (1) autoscope unit, four (4) autoscope image sensors with junction boxes, one (1) camera interface panel and 9” Color Monitor for programming.
17)
Fiber Optic Modem Rev. 1/05 58 - 11
18)
d.
Vehicle Identifying Infrared Optical Preemption and Communications System with (4) Sensors
Measurement of Payment This item will not be measured as a separate pay item but will be paid for under the lump sum price for traffic signal shown on the unit price table as traffic signal.
58.03 PERSONNEL: A.
Supervision: An experienced superintendent and necessary assistants competent to supervise the particular types of work involved, shall be assigned tot he project by the Contractor and shall be available on the site at all times when work is in progress. The Contractor shall notify the Engineer, in writing of the Superintendent assigned, and he shall represent the Contractor, and all directions given to the Superintendent shall be as binding as if given to the Contractor. (03/03)
B.
Workmen: Only persons skilled in the type of work which they are to perform shall be employ3ed. The Contractor shall, at all times, maintain discipline and good order among his employees and shall not employ on the work any unfit person or persons. Unskilled workmen may be employed if they are in an approved apprentice program and/or given qualified supervision on the job. Additionally, at least one supervisor shall be certified by IMSA to Traffic Signal Level II, and shall be at the project site at all times while work pertinent to the signal system, is in progress. Certification may be waived in lieu of documented Traffic Signal Training consisting of appropriate college, trade school or nationally recognized short course training (i.e., North Western University, FHWA, State Highway Research and Technology Transfer Agency, etc.) Waiver of IMSA certifications shall be at the sole discretion of the Owner. Identity and credentials of proposed supervisor must be submitted with the bid. (03/03)
C.
In the event of any disagreement regarding compliance with these requirements, the decision of the Traffic Engineer shall be final. (03/03)
Rev. 1/05 58 - 12
