Detector Loop Art. 886.04
885.03 Installation. The inductive loop detector shall be installed inside a
traffic signal controller cabinet. The detector shall be card rack type or shelf-mounted type. The detector shall be single-, two-, or four-channel.
885.04 Basis of Payment. This work will be paid for at the contract unit price
per each for INDUCTIVE LOOP DETECTOR or INDUCTIVE LOOP DETECTOR WITH SYSTEM OUTPUT, which price shall include the necessary connections and adjustments for proper operation. If the detector unit has more than one complete detection channel, each complete detection channel will be considered as a detector for payment. SECTION 886. DETECTOR LOOP
886.01 Description. This work shall consist of furnishing and installing a
detector loop in the pavement.
886.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Detector Loop and Sealer .................................................................. 1079.02 The detector loop and sealer shall be according to the manufacturer. CONSTRUCTION REQUIREMENTS
886.03 Testing. The detector loop shall be tested according to
Article 801 — 13(b)(2).
886.04 Installation. The detector loop location, shape, size, and the number
of turns shall be as shown on the plans or as recommended by the manufacturer of the related inductive loop detector. Multiple loops connected to the same detector channel shall be connected in series or as directed by the Engineer. The detector loop shall be installed in the pavement according to the details shown on the plans and the following requirements.
a.Type I detector loop shall consist of furnishing a detector loop wire enclosed in a flexible tubing and installing it in a sawed slot in the pavement. The sawed slot shall be clean, dry, and have a smooth bottom. Diagonal saw cuts or drilled holes shall be made at all corners to prevent sharp bends in the wire. The saw cuts at the corners shall be overlapped so they have full depth. The slot shall be cleaned by air pressure removing any debris and water. Each tube containing the loop wire shall be pushed into the saw cut with a wooden tool to prevent tube damage. Retainers shall be added to the sawed slot to prevent the loop wires from floating during the pouring of the loop sealant. These retainers shall be 1 in. (25 mm) pieces of the tubing bent in half. The loop wires not embedded in Art. 886.04 Detector Loop the pavement shall be evenly twisted approximately 5 turns per foot (16 turns per meter).
b.Type II detector loop shall consist of furnishing a mineral-insulated metal- sheathed cable, installing it on a HMA or portland cement concrete base course and covering it with a HMA surface course. The surface course shall be between 2 and 5 in. (50 and 125 mm) thick. The cable shall be secured to the base course by a method approved by the Engineer. Slanted holes shall be drilled through the base course. The leads shall be bound together with tie wraps or fish tape rope, inserted through the hole, and positioned in place to make splices in the junction box or handhole. The end of the cable shall be stripped, insulated and installed in a sleeve assembly according to the manufacturer’s instructions to prevent moisture from entering the cable. The sleeved conductors shall be spliced together to form one continuous length. As each splice is made, it shall be metered to ensure a proper connection. The conductors must be soldered together and each conductor completely wrapped with two layers of rubber or vinyl electrical tape.
c.Type Ill detector loop shall consist of one of the following.
1.Rigid Plastic Conduit. This detector loop shall consist of furnishing a detector loop wire sealed with asphalt rubber or waterproof flexible sealant inside a rigid plastic conduit, installing it on a HMA or portland cement concrete base course and covering it with a HMA surface course. The surface course shall be between 2 and 5 in. (50 and 125 mm) thick. The conduit shall be secured to the base course by a method approved by the Engineer. Slanted holes shall be drilled through the base course. The plastic conduit shall be inserted through the hole toward the junction box or handhole.
2.Heavy Duty Reinforced Rubber Conduit. This detector loop shall consist of furnishing a detector wire sealed with asphalt rubber or waterproof flexible sealant inside a conduit made of heavy duty reinforced rubber hose. When the detector loop is installed on a HMA or portland cement concrete base course, and covered by a HMA surface course, the surface course shall be between 2 and 5 in. (50 and 125 mm) thick. When the detector loop is covered by portland cement concrete surface course, the surface course shall be between 2 and 16 in. (50 and 400 mm) thick. The conduit shall be secured to the base course by a method approved by the Engineer. The conduit shall be secured to reinforcing steel in the pavement, at each point the conduit crosses the reinforcing steel, in order to prevent shifting of the loop as the surface course is poured. When loops are secured to the top of reinforcing steel, the steel shall not cut into the conduit when the portland cement concrete surface course is poured over the top. In new roadways, the conduit may be placed directly on top of the gravel substrate. Pedestrian Push-Button Art. 888.02
886.05 Method of Measurement. This work will be measured for payment in
feet (meters) in place. Type I detector loop will be measured along the sawed slot in the pavement containing the loop and lead-in, rather than the actual length of the wire. Type II and Type Ill detector loops will be measured along the detector loop and lead-in embedded in the pavement, rather than the actual length of the wire.
886.06 Basis of Payment. This work will be paid for at the contract unit price
per foot (meter) for DETECTOR LOOP, of the type specified. SECTION 887. EMERGENCY VEHICLE PRIORITY SYSTEM
887.01 Description. This work shall consist of furnishing a light transmitter,
furnishing and installing a light detector, or a light detector amplifier, for an emergency vehicle priority system.
887.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Emergency Vehicle Priority System ........................................................ 1072 CONSTRUCTION REQUIREMENTS
887.03 Installation. The light transmitter shall be furnished to the user as
directed by the Engineer. The light detector shall be installed on or near a traffic signal head with necessary connections for proper operation, as indicated on the plans. The confirmation beacon shall be installed near the light detector or as indicated on the plans and shall face in the same direction as the corresponding light detector. The light detector amplifier shall be installed inside a traffic signal controller cabinet or in the light detector housing.
887.04 Basis of Payment. This work will be paid for at the contract unit price
per each for LIGHT TRANSMITTER, LIGHT DETECTOR, or LIGHT DETECTOR AMPLIFIER. Furnishing and installing a confirmation beacon shall be included in the cost of the light detector. SECTION 888. PEDESTRIAN PUSH-BUTTON
888.01 Description. This work shall consist of furnishing and installing a
pedestrian push-button and traffic signal instruction sign.
888.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Pedestrian Push-Button ..................................................................... 1074.02
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 758–760 of 1,217. View official source ↗