Art. 1069.08 Foundation and Breakaway Devices the hood. The rod shall be threaded and coupled at the point of hood penetration to facilitate the removal of the hood. A flexible copper braid connector of #2 copper equivalent shall be installed between the lightning rod (air terminal) and grounding lug at the top of the tower shaft. Good metal-to-metal contact shall be ensured by using listed compression style connectors at all connections to the air terminal conductor. A minimum #4 solid bare soft drawn copper grounding electrode conductor shall be attached between the grounding electrode at the foundation and the ground pad in the handhole and shall be kept as short as possible. The grounding electrode shall be according to Section 806. SECTION 1070. FOUNDATION AND BREAKAWAY DEVICES
1070.01 Light Pole Foundation, Metal. Metal foundations shall be fabricated
from material new and unused in any previous application and shall be galvanized according to AASHTO M 111. The manufacturer shall provide a certification that the materials are new and meet the specified requirements and shall accompany the submittal. Metal foundations shall be fabricated from steel. Baseplate AASHTO M 270, Grade 36 (M 270M, Grade 250) Shaft ASTM A 252, Grade 2, Phosphoru s 0.04% max., Sulfur 0.05% max. Helix Screw AASHTO M 270, Grade 36 (M 270M, Grade 250) Pilot Point AASHTO M 270, Grade 36 (M 270M, Grade 250) Metal foundations shall be fabricated with two wiring entry slots parallel with the shaft axis and aligned with base plate faces 180 degrees apart. Continuous slots up and through the base plate will not be acceptable. The shaft of the foundation shall be socketed into the top plate and welded on both sides. Foundation shaft diameters, baseplate size, shaft length and bolt circles shall be as detailed on the plans. Foundations shall be fully coordinated with specified poles. Fully threaded and galvanized anchor rods or stud bolts with washers and nuts shall be furnished with the foundations and shall be according to Article 1006.09. Anchors furnished according to ASTM F 1554 shall be Grade 105 (Grade 725). Metal foundations shall come complete with galvanized steel plates or plugs to fill any penetrations in the base plate which are in addition to the four threaded stud holes and the center wireway opening.
1070.02 Anchor Rods. Anchor rods shall be according to Article 1006.09,
Grade 105 (Grade 725) and full length galvanized with washers and nuts.
1070.03 Light Tower Anchor Rod Assembly. Anchor rods, washers, and
nuts shall be according to Article 1070.02. Anchor rod information shall be submitted Foundation and Breakaway Devices Art. 1070.04 for approval and shall be fully coordinated with the tower manufacturer’s requirements. Top anchor rod nuts for all towers shall be the self-locking type with nylon or steel inserts.
1070.04 Breakaway Devices. Breakaway devices shall be as follows.
a.Breakaway Couplings
1.General. Certification shall be submitted from the supplier that the device used under the conditions of the particular design meets the AASHTO breakaway specification. Certification shall include test results performed by the manufacturer, supplier or others. If test results have been previously approved by a letter from the FHWA, a copy of the approval letter from FHWA should accompany the certification. The coupling shall not alter the bolt circle of the pole. The breakaway device shall be vandal resistant and shall not adversely affect the light pole installation and maintenance or decrease the resistance of the light pole to non-collision type of design loading. The breakaway device shall be field attachable and detachable.
2.Breakaway Coupling Cover. The breakaway device shall have a cover enclosing the space between the bottom of the pole base plate and the foundation consisting of a Type 304 stainless steel wire cloth mesh with a maximum opening of 1/4 in. (6 mm) and a minimum wire diameter of AWG No. 16 (1.6 mm) with a minimum lap of 6 in. (150 mm) to enclose the void between the pole base and the foundation. The lap shall be tied together with Type 304 stainless steel wire ties. When specified, an aluminum skirt cover shall be provided over the wire cloth. The aluminum skirt shall be made of ASTM B209 Alloy 3003-H14 or 5052-H32, 0.0625 in. (1.6 mm) thick minimum. The enclosure shall fit snugly around the wire cloth and breakaway devices between the bottom face of the pole base plate and the top of the foundation. Veritical or horizontal movement of the enclosure will not be acceptable.
b.Transformer Base
1.The breakaway device shall be a cast and welded aluminum transformer base type pole base. The breakaway device shall have a listing of approval by FHWA to AASHTO breakaway requirements. This shall require compliance to AASHTO “Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals, Sixth Edition, 2013”. Submittal information shall document the approval listing.
2.The device shall be approximately 17 in. (430 mm) high and shall have a large fiberglass or polyethylene access door of a color to match the base finish which shall be held in place with a button-type tamper resistant stainless steel screw or other means approved by the Art. 1070.04 Emergency Vehicle Priority System Engineer. The polyethylene access door shall be fabricated from a high density polyethylene. The door shall withstand temperature extremes of -76 to 150 F (-60 to 65 C). Ultraviolet light inhibitors shall also be incorporated into the door material. The door shall be reinforced and have tabs to lock into the transformer base door frame.
3.The appearance of the breakaway device shall be of such general configuration as not to detract from the aesthetic value of the light pole. The device shall have a natural aluminum finish.
4.Bolt Circle Size. The transformer base shall come in two standard sizes.
a.11.5 in. (290 mm) Pole Bolt Circle Devices. Breakaway devices for poles having nominal 11.5 in. (290 mm) bolt circles shall accommodate bottom (foundation) bolt circles ranging roughly 10 to 12 in. (255 to 300 mm) and shall accommodate top (pole) bolt circles ranging roughly 10.5 to 12 in. (265 to 300 mm).
b.15 in. (380 mm) Pole Bolt Circle Devices. The bottom foundation bolt circle shall have a range of 15 to 17 in. (380 to 430 mm) and shall accommodate top (pole) bolt circles having a range of 13 to 15 in. (330 to 380 mm). TRAFFIC SIGNALS SECTION 1071. RESERVED SECTION 1072. EMERGENCY VEHICLE PRIORITY SYSTEM
1072.01 Emergency Vehicle Priority System.
a.System Requirements. The system shall operate over an ambient temperature of -22 to 165 °F (-30 to 74 °C) and in 0 to 95 percent relative humidity. All logic and timing circuitry shall be solid state. All printed circuit assemblies shall be according to NEMA Standards for Traffic Control Systems, TS 2.
b.Light Transmitter. The transmitter shall transmit a pulsed high intensity light energy in a forward direction. The on/off condition shall be controlled by an on/off switch and shall be indicated by a light located adjacent to the switch. The transmitter shall operate on 10 to 15 VDC input voltage, but shall not be damaged by input voltage surges up to 25 VDC. Controller Art. 1073.01 The transmitter shall not generate voltage transients on the battery input line which exceed the battery voltage by more than 4 V.
c.Light Detector. The detector shall be capable of receiving high intensity light energy from one or both of two axially opposed directions, as indicated on the plans. The internal circuitry of a detector unit shall be potted in a semi-flexible compound for moisture resistance. The standard operating amperage shall be less than 6 A. Internal circuitry shall prevent electrical output due to steady state ambient light. The confirmation beacon shall be a weatherproof floodlight fixture with a 150 W long life floodlight.
d.Light Detector Amplifier. The detector amplifier shall be a solid state design. The detector amplifier shall have at least two channels and the capability of interfacing with another detector amplifier for channel expansion. The detector amplifier shall have LED indicator lights to indicate power on, light energy being received, and channel called. The detector amplifier, when actuated, shall continue to operate for at least six seconds after any interruption of light energy. The detector amplifier shall sustain no permanent damage when subject to a transient produced by the discharge of a 10 microfarad capacitor charged to 600 V and applied to the AC line. SECTION 1073. CONTROLLER
1073.01 Traffic Actuated Solid State Digital Controller. A traffic actuated
solid state digital controller shall be according to NEMA Standards for Traffic Control Systems, TS 2 and fully compatible with the National Transportation Communications for ITS (Intelligent Transporation Systems) Protocol (NTCIP) standards. Additionally, the controller shall be of digital design having eight independent phases and four overlap phases and shall be according to the following.
a.Definitions.
1.Anti-backup. A programmable controller logic function inhibiting a call on a leading left turn phase (1, 3, 5 or 7) from being served prior to crossing the barrier if the opposing through phase (2, 4, 6, or 8) is on, and thus avoiding left turn trap.
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 1013–1016 of 1,217. View official source ↗