- 208 - SECTION 409 -- SIGNAL HEADS
409.01 Description
1.Traffic Signals and Pedestrian Signals:
a.The Contractor shall furnish and install signal heads of the type and size shown in the contract. This work shall include furnishing and installing the signal head, lamps, mounting bracket, and backplate (if required). Pole mounted signals do not require backplates.
2.LED Traffic Signal Modules:
a.The contractor shall furn ish and install LED traffic signal modules of the type and size shown in the contract. This work shall include removing the incandescent lamp, lamp socket, reflector, and lens from an existing signal head and then retrofitting the signal head with a LED module.
409.02 Material Requirements
1.Traffic and pedestrian signal heads shall be in conformance with Section 1073.
2.Optically programmed signal heads shall be on the Department’s Approved Products List.
3.LED traffic signal modules shall be on the Department’s Approved Products List.
409.03 Construction Methods
1.The Contractor shall install si gnals plumb, level, and securely attached with all fittings, so they present a neat appearance.
2.If required, the Contractor shall furnish pipe nipples in appropriate lengths so that all signals on one span will hang at the same elevation.
3.If, after the signal assemblies are erected and t he road is open to public travel, the signal system is no t put immediately into operation, the signal faces shall be covered with burlap or other opaque material subject to the approval of the Engineer. Inoperat ive signals on roads open to the public shall always be covered. Tilting the signals upward is not an acceptable alternative to covering the heads.
409.04 Method of Measurement
1.Signal heads shall be measured by the each.
409.05 Basis of Payment
1.Pay Item Pay Unit Traffic Signal, Type TS _____ Each (ea) Pedestrian Signal, Type PS _____ Each (ea) Install Traffic Signal, Type TS _____ Each (ea) Install Pedestrian Signal, Type PS _____ Each (ea) LED Traffic Signal Module, Type _____ Each (ea) LED Pedestrian Signal Module, Type _____ Each (ea) Install LED Traffic Signal Module, Type _____ Each (ea)
2.Payment is full compensation for all work described in this Section. - 209 - SECTION 410 -- DETECTORS
410.01 Description
1.The Contractor shall furnish and install pedestrian pushbuttons and vehicle detectors of the type a nd size shown in the contract.
410.02 Material Requirements
1.Vehicle and pedestrian detectors shall be in conformance with requirements in Section 1073.
410.03 Construction Methods
1.The Contractor shall install a ll detectors shown in the contract, including any identified as De partment-furnished detectors.
2.The Contractor shall install pr eformed loop vehicle detectors under new pavement. Saw cut loop detectors shall be installed in existing pavement and shall not be substitu ted for preformed detectors.
3.The Contractor shall install magnetic detectors for 2-lane approaches under the lane line between lanes. Magnetic detectors installed under 1-lane approaches shall be instal led under the outside edge of the lane.
4.Preformed Loops: a. The Contractor shall place preformed loops 1 inch to 2 inches (25 mm to 50 mm) below the surface of the subgrade or base course before paving. Care shall be taken to prevent damage to the loop during the paving operation.
5.Saw Cut Loops a. The Contractor shall exercise care to prevent damage to the wires when installing the loops in the sawed slots in pavement.
b.The slots shall be blown clean of all stones and dirt.
c.The wire shall be tamped as deeply as possible into the slot using a blunt stick. The use of sharp in struments such as screwdrivers, etc., is not allowed.
d.Caution shall be exercised at all corners and sharp bends so as not to damage the insulation or introduce undue stresses in the wire.
e.Testing of the loops during and after installation shall be performed in the manner described by the Engineer.
6.A splice between the detector and the lead-in cable shall be made in the pull box nearest the detector. No other splice shall be made in the detector leads.
7.Pedestrian pushbuttons shall be in stalled as shown in the contract.
410.04 Method of Measurement
1.Vehicle detectors and pedestrian pushbuttons shall be measured by the each.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 242–242 of 1,048.