- 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.
410.05 Detectors
- 210 - 410.05 -- Basis of Payment
1.Pay Item Pay Unit Vehicle Detector, Type TD _____ Each (ea) Vehicle Detector, Type ___ Preformed Each (ea) Install Vehicle Detector, Type TD _____ Each (ea) Install Vehicle Detector, Each (ea) Type ____ Preformed Pedestrian Pushbutton, Type PPB Each (ea) Install Pedestrian Pushbutton Each (ea) 2. Payment is full compensation for all work described in this Section. - 211 - SECTION 411 -- TRAFFIC SIGNAL CONTROLLER
411.01 Description
1.The Contractor shall furnish and in stall traffic signal controllers of the type and at the locations shown in the contract.
2.All equipment required to be installed for the power service, including but not limited to, meter sockets and breaker boxes is considered subsidiary to the traffic signal controller installation.
411.02 Material Requirements
1.Traffic signal controllers s hall meet the requirements in Section 1073.
2.Concrete shall meet the requirements in Section 1002.
411.03 Construction Methods
1.The controller shall be placed on a concrete pad as shown in the contract. The controller shall not be pl aced in a ditch or depression that is subject to water ponding or flooding. Pole mounted controllers shall have a pad constructed below the controller as shown in the contract.
2.All conduits within the cabinet shall be clear of any braces or equipment which would interfere with cable runs. One spare 2 inch (50 mm) conduit bend shall be installed in each pad mounted controller foundation. The ends of the bend shall be capped. This work shall include furnishing and installing the controller, concrete, s pare bend, and all excavation, backfilling, labor, equipment, tools, and incidentals required to complete the work.
411.04 Method of Measurement
1.Traffic signal controllers shall be measured by the each.
411.05 Basis of Payment
1.Pay Item Pay Unit Traffic Signal Controller, Each (ea) Type TC _____ Install Traffic Signal Controller, Each (ea) Type TC _____
2.Concrete Pad is subsidiary to controller. 3. Payment is full compensation for all work described in this Section.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 243–244 of 1,048.