Art. 1076.04 Post and Foundation The shielding shall be 100 percent effective by providing a metal-to- metal contact between adjacent wraps. The capacitance measured between conductors shall be 30 (100) picofarads or less per foot (meter). The capacitance measured between one conductor and another conductor connected to the shield shall be 55 (180) picofarads or less per foot (meter).
4.Jacket. The jacket shall be polyvinyl chloride according to IMSA No. 39-2, or polyethylene according to IMSA No. 40-6.
5.Identification. Each shipping length of cable shall show the name of the manufacturer, the year of manufacture, the voltage rating, the UL listing mark, and the conductor size in AWG. This information shall be applied every 2 ft (0.61 m) or less to the outer surface of the jacket by indent printing. The electric cables furnished shall not be dated more than five years prior to the time of installation.
6.Sampling, inspection and acceptance. The cable shall be according to IMSA No. 39-2, or IMSA No. 40-6.
1077.01 Traffic Signal Post. The traffic signal post shall be designed to
support the traffic signal loading shown on the plans. The design and fabrication shall be according to the AASHTO LRFD Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals.
a.Post. The post shall be made of steel or aluminum and have an outside diameter of 4 1/2 in. (115 mm). The post shall be threaded for assembly to the base. Aluminum posts shall be according to the specifications for Schedule 80 aluminum pipe. Steel posts shall be according to the specifications for Schedule 40 steel pipe.
b.Base. The base of a steel post shall be cast iron. The base of an aluminum post shall be aluminum. The base shall be threaded for the attachment to the threaded post. The base shall be approximately 15 in. (375 mm) high and 13 1/2 in. (335 mm) square at the bottom. The bottom of the base shall be designed to accept four 5/8 in. (16 mm) diameter anchor rods evenly spaced in a 12 1/2 to 13 in. (320 to 330 mm) diameter circle. The base shall be true to pattern, with sharp clean cutting ornamentation, and equipped with access doors for cable handling. The door shall be fastened to the base with stainless steel screws. A grounding lug shall be provided inside the base. Post and Foundation Art. 1077.03 The aluminum post and base shall be drilled at the third points around the diameter and 1/4 in. by 2 in. (6 mm by 50 mm) stainless steel bolts shall be inserted to prevent the post from turning and wobbling.
c.Anchor Rods. The anchor rods shall be a minimum of 5/8 in. (16 mm) in diameter and 16 in. (400 mm) long and shall be according to Article 1006.09. The anchor rods shall be threaded approximately 3 in. (75 mm) at one end and have a bend at the other end. The first 5 in. (125 mm) at the threaded end shall be galvanized. One each galvanized nut and washer shall be furnished with each anchor rod.
d.Finish. The steel post and the cast iron base shall be either hot-dipped galvanized according to AASHTO M 111 or shop painted with one coat of primer and two coats of yellow enamel according to Section 851. If the post and the base are threaded after the galvanization, the bare exposed metal shall be immediately cleaned to remove all cutting solvents and oils, and then spray painted with two coats of an approved galvanized paint.
1077.02 Pedestrian Push-Button Post. Pedestrian push-button posts shall be
as follows.
a.Post. The steel post shall be according to Article 1077.01, except the nominal size shall be 3 in. (75 mm). The Type I pedestrian push button post shall use a 3 in. (75 mm) threaded connection. The Type II pedestrian push- button post shall include two flange plates located approximately 1 in. (25 mm) above the ground level.
b.Finish. The post and cap shall be either hot-dipped galvanized according to AASHTO M 111 or shop painted with one coat of primer and two coats of yellow enamel according to Section 851. If the post is threaded after galvanization, the bare exposed metal shall be immediately cleaned to remove all cutting solvents and oils, and then spray painted with two coats of an approved galvanized paint.
1077.03 Mast Arm Assembly and Pole. Mast arm assembly and pole shall be
as follows.
a.Steel Mast Arm Assembly and Pole and Steel Combination Mast Arm Assembly and Pole. The steel mast arm assembly and pole and steel combination mast arm assembly and pole shall consist of a traffic signal mast arm, a luminaire mast arm or davit (for combination pole only), a pole, and a base, together with anchor rods and other appurtenances. The configuration of the mast arm assembly, pole, and base shall be according to the details shown on the plans.
1.Loading. The mast arm assembly and pole, and combination mast arm assembly and pole shall be designed for the loading shown on the Highway Standards or elsewhere on the plans, whichever is greater. The design shall be according to AASHTO “LRFD Specifications for Structural Supports for Highway Signs, Luminaries and Traffic Signals” 2015 Edition. However, the arm-to-pole connection for tapered signal Art. 1077.03 Post and Foundation and luminaire arms shall be according to the “fillet welded, ring stiffened box connection” detail as shown in Figure C5.6.7-2. The mast arm and pole shall be designed assuming the ADT > 10,000, Risk Category Typical, and Fatigue Category I Natural Wind Gust only.
2.Structural Steel Grade. The mast arm and pole shall be fabricated according to ASTM A 595, Grade A or B; ASTM A 572, Grade 55; or ASTM A 1011, Grade 55 HSLAS Class 2. The base and flange plates shall be of structural steel according to AASHTO M 270, Grade 50 (M 270M, Grade 345). Luminaire arms and trussed arms 15 ft (4.5 m) or less shall be fabricated from one steel pipe or tube size according to ASTM A 53, Grade B or ASTM A 500, Grade B or C. All mast arm assemblies, poles, and bases shall be galvanized according to AASHTO M 111.
3.Fabrication. The design and fabrication of the mast arm assembly, pole, and base shall be according to the requirements of the Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals published by AASHTO. The mast arm and pole may be of single length or sectional design. If section design is used, the overlap shall be at least 150 percent of the maximum diameter of the overlapping section and shall be assembled in the factory. The manufacturer will be allowed to slot the base plate in which other bolt circles may fit, providing that these slots do not offset the integrity of the pole. Circumferential welds of tapered arms and poles to base plates shall be full penetration welds.
4.Shop Drawing Approval. The Contractor shall submit detailed shop drawings showing design materials, thickness of sections, weld sizes, and anchor rods to the Engineer for approval prior to fabrication. These drawings shall be at least 11 x 17 in. (275 x 425 mm) in size and of adequate quality for microfilming.
b.Anchor Rods. Anchor rods shall be according to Article 1006.09, Grade 105, and shall be threaded a minimum of 7 1/2 in. (190 mm) at one end and threaded a minimum of 2 in. (50 mm) with matching hex head nut at the other end. At a minimum, the first 12 in. (300 mm) at the threaded end shall be galvanized. Two nuts, one lock washer, and one flat washer shall be furnished with each anchor rod.
1077.04 Traffic Signal Wood Pole.
a.Pole. Wood pole shall be full treated southern pine, Douglas fir, or western red cedar according to the American National Standard Specifications and Dimensions for Wood Poles. The preservative treatment shall be according to the American Wood Preservers' Association Standard T1.
b.Down Guy. The down guy shall consist of a guy wire and other appurtenances as shown on the plans. The guy wire shall be of 3/8 in. (9.5 mm) nominal diameter seven strand, zinc-coated steel wire according to Light Emitting Diode (LED) Traffic Signal Head Art. 1078.01 ASTM A 475, Utilities Grade or better. The other appurtenances shall be galvanized according to AASHTO M 232 and be according to the following. The anchor shall have a minimum expanded area of 125 sq in. (81,000 sq mm). The anchor rod shall have a nominal diameter of 5/8 in. (16 mm) and a minimum breaking strength of 11,500 lb (51,200 N). The guy guard shall be 7 ft (2.1 m) long, tapered, and made of 18 gauge steel minimum, except for sidewalk guys, the guy guards shall be made of heavy-duty plastic. The guy wire clamps shall be three bolt and have a minimum breaking strength of 11,500 lb (51,200 N). The dead-ends shall be made of the same material as the guy wire. SECTION 1078. LIGHT EMITTING DIODE (LED) TRAFFIC SIGNAL HEAD
1078.01 Light Emitting Diode (LED) Signal Head and Optically
Programmed LED Signal Head.
a.Face. The signal face shall be of sectional design and expandable.
b.Housing and Door. The polycarbonate housing or door shall be made of Ultra-Violet stabilized polycarbonate resin and shall be molded in one piece with a minimum thickness of 0.09 in. (2.25 mm). The top and bottom of each housing shall have an opening to accommodate standard 1.5 in. (38 mm) pipe fittings and brackets. The top and bottom openings shall each have an interlocking ring integral with the signal section. The locking ring shall have 72 teeth, permitting rotation of the signal section in five degree steps. The door shall be securely attached to the housing with stainless steel hardware. All access openings shall be provided with neoprene or rubber gaskets. Each signal section shall attach to each adjoining section in the signal head with sufficient strength to prevent separation or movement between the sections.
c.Optical Unit.
1.The LED signal section shall be according to the following.
a.General Requirements. The LED signal head shall fully comply with the Institute of Transportation Engineers (ITE) LED purchase specification, “Vehicle Traffic Control Signal Heads: LED Circular Signal Supplement”, and “Vehicle Traffic Control Signal Heads:
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 1041–1044 of 1,217. View official source ↗