730TRAFFIC SIGNALS

636

730-A Removal of Existing Traffic Control Unit (1) (2) - per lump sum 730-C Furnishing and Installing Traffic Control Unit (2) - per lump sum 730-E Metal Traffic Signal Pole Foundation – per each 730-F Metal Traffic Signal Pole with (3) Mast Arm Assembly - per each 730-G Traffic Signal Pole, (4), (5) - per each 730-H Loop Wire - per linear foot {meter} 730-I Loop Detector Lead-In Cable - per linear foot {meter} 730-J Vehicle Loop Detector - per each 730-K Traffic Signal Junction Box (6) - per each 730-L (7), (8), Conduit - per linear foot {meter} 730-M Interconnect Cable, (9), (10) AWG, (11), (12) - per linear foot {meter} 730-N Luminaire Extension Assembly, (13) feet {meters} - per each 730-O Illuminated Sign Assembly (14) (15) - per each 730-P (16) Signal Head, (17) Section, Type (18) - per each 730-Q Miscellaneous Equipment, (19) – per each 730-R Controller (20), Type (21), (22) Output Phase Channels - per each 730-S (23) Traffic Signal Preemption (24) (25) (2) – per lump sum 730-T Electrical Power Service Assembly (26)(27) – per each 730-U (28) Detection System (2) – per lump sum 730-Y (29) Pedestal Pole and Foundation with (30) – per lump sum

and Foundation, Malfunction Management Unit, TS2 Detection Rack, SDLC Bus)

TRAFFIC COUNTING EQUIPMENT 637

TRAFFIC COUNTING EQUIPMENT

731.01Description

This Section shall cover the work of furnishing and installing, complete in place, traffic counting equipment as shown on the plans, at locations shown on the plans, all in accordance with the details shown on the plans and these Specifications. For the purpose of these Specifications traffic counting equipment will be classified as operational units. Traffic Counting Units shall be classified by “Type” which will designate type of detection, for inductive loops, the number and design of the loops in conjunction with the cabinet location, in accordance with details shown in the plans. For the definition of equipment, words, and terminology used in the furnishing and installing of Traffic Counting Equipment, refer to the appropriate publications of the Institute of Transportation Engineers (I.T.E.) and to the Manual of Uniform Traffic Control (MUTCD).

731.02Materials

Manufacturers' warranties and guaranties furnished on material and equipment used in the work shall be delivered to the Engineer; likewise, instruction sheets and parts listed supplied shall be delivered to the Engineer upon receipt of the equipment. Reference to a particular product by manufacturer, trade name, or catalog number establishes the quality standards of material and equipment required for this installation and is not intended to exclude products equal in quality and similar in design. Whenever any article, material, or equipment is defined by describing a proprietary product or by using the name of a manufacturer or vendor, the term "or approved equal" if not inserted, shall be implied. Electrical materials shall conform to the Standards of the National Electrical Manufactures Association (NEMA) and/or the Underwriters Laboratories, Inc. (UL), in every case where a standard has been established for that particular article, material, or equipment. All material and equipment shall be of the best quality and workmanship and shall be new unless otherwise noted on the plans. Throughout the entire project, all units of any one item, such as enclosures, and associated equipment, etc., shall be made by the same manufacturer. Inasmuch as certain materials and equipment furnished for use under this Section will be standard production type products, acceptance will be made by the Engineer based on selected confirmation tests, the manufacturer's certification of the material and/or design conformance to the requirements noted in this Section, details shown on the plans, and visual inspection at the job site. The manufacturer shall make available to the Department test data and material samples from the production runs for use in evaluation of their product.

Loop wire conductors shall be stranded, 12AWG, soft or annealed copper wire of not less than 98 percent conductivity and shall be insulated for 600 volts or more with a cross-linked polyethylene insulation. Conductors shall be Type RHW/RHW2.

Non-metallic conduits shall be Type II, Schedule 40, PVC unless otherwise noted on the plans. All non-metallic conduits and fittings shall conform to UL Standard 651 or NEMA TC-2 latest edition.

Liquidtight flexible metal conduits shall conform to UL listed Type UA for the intended use.

The structural design, submittal, material, and fabrication requirements given in Sections 730, 718 and 891 shall be applicable to the furnishing and installation of a pole that is required for the mounting of traffic detection equipment.

ALDOT shall provide the solar panels, mounting brackets, and cabling required for the installation of the solar panels at the site.

TRAFFIC COUNTING EQUIPMENT 638

ALDOT shall provide the cabinet, mounting brackets, and equipment for the installation for the required installation type.

731.03Construction Requirements

All required material and equipment shall be installed in accordance with the manufacture’s recommendations, details shown in the plans, and as designated in the proposal. All installations shall comply with the regulations of the latest edition of the National Electrical Code (NEC) and the latest edition of the National Electrical Safety Code. Coordination of this work with regular roadway or bridge work will be of prime importance to prevent undue damage to completed items of work or existing facilities. Any damage to existing facilities caused by the installation of the material and/or equipment required under this section of work, shall be repaired by the Contractor at no additional cost to the State. After all equipment has been installed and an operational check has been instigated, the Contractor shall furnish the Engineer with a corrected set of plans showing in detail all changes on construction from the original plan details.

All metal enclosures containing electric wires and/or equipment shall be grounded. Ground rods shall be installed at all the terminal strip enclosure. Single ground rods shall be driven vertically until the top of the rod is at least 12 inches {305 mm} below the finished grade. A length of No. 4 bare soft drawn copper shall be attached to the ground rod clamp as shown on the plan details. Where a grounding conductor passes through a metal conduit, a suitable grounding bushing shall be placed on each end of the conduit and connected to the ground wire. Where non-metallic conduit is used, a separate continuous grounding conductor shall be extended from the service ground to all equipment and shall be used for grounding purposes only. Testing of Grounding System: The effectiveness of the ground rod shall be determined by measuring resistance from the pole enclosure to a convenient underground water line, with a 0-50 ohm megger (J.H. Biddle Company or equal) where a water line is available and with auxiliary ground method where the water line is not available. The two auxiliary ground rods shall be not less than 50 feet and 100 feet {15 m and 30 m}, respectively, from the tested rod. If reading is greater than 25 ohms, additional rods shall be installed until a reading of 25 ohms is obtained.

All wiring shall be installed in a neat and workmanlike manner. Wiring within enclosure cabinet shall be neatly arranged and laced. Loop wire shall be one continuous run without splicing. All ends of cable shall be taped to exclude moisture and shall be so kept until terminal strips are attached.

A conduit run shall be completely installed before the installation of wire. Wires in conduits shall be carefully pulled into place using approved methods so that the cable will be installed free from any electrical or mechanical injury. Powdered soapstone, talc, or other inert lubricant specifically designed for the purpose shall be used. A conduit run shall be completely installed before the installation of wire. Wires in conduits shall be carefully pulled into place using approved methods so that the cable will be installed free from any electrical or mechanical injury. Conductors shall be handled and installed in such a manner as to prevent kinks, bends or other distortion which could damage the conductor or outer covering. All cables within a single conduit shall be pulled at the same time. Loop wire shall be installed in slots cut in the pavement, at locations designated on the plans or as directed by the Engineer. The slot shall be formed by sawing pavement with approved equipment designed for sawing pavement, to the width and depth indicated by the plan details or directed. The slot shall be cleaned of all foreign loose debris using compressed air or other approved means before installation of the loop wire. After installation of the loops, the slots shall be sealed with an approved sealant manufactured specifically for embedding loop detector wire in concrete or bituminous pavements. All conductors installed under paved areas shall be encased. Installation of the casing shall be made either prior to placement of the pavement with thick wall rigid metallic or rigid casing, or it shall be jacked or bored through the roadbed under the pavement using thick wall rigid metallic casing providing a minimum cover of 30 inches {762 mm}. The sealant proposed for use shall be shown in the proposed list of materials to be used. TRAFFIC COUNTING EQUIPMENT 639

Conduits shall be joined by approved fittings using methods prescribed the manufacturer of the conduit. Where non-metallic conduit join metal conduits, connection shall be made using appropriate couplings to form a watertight raceway. Bushings shall be installed as shown on the plan details. Underground conduit shall be installed as shown on the plans with a minimum cover of 30 inches {762 mm }. When rock is encountered in the in the bottom of the trench, the conduit shall be installed in a bed of well compacted, fine-grained soil at least 2 inches {50 mm} thick. If 30 inches {762 mm} cannot be attained, convert the conduit to asphalt painted metallic conduit installed as deep as practical but no less than 6 inches {152 mm}. Seeding and mulching of disturbed areas shall be backfilled and compacted to prevent future settling. Seeding and mulching of disturbed areas shall be as directed by the Engineer as a subsidiary obligation of the conduit installation. Precautions shall be taken to be sure that the conduit will be located to avoid conflict with proposed guardrail, signpost, etc. Where possible, a minimum of 12 inches {305 mm} shall be provided between the finished lines of conduit runs and utility facilities, such as gas lines, water mains, or other underground facilities not associated with the electrical system. Where the conduit run is adjacent to concrete walls, piers, footings, etc., a minimum of 4 inches {102 mm} of undisturbed earth or firmly compacted soil shall be maintained between the conduit and the adjacent concrete. Unless specified on the plans, trenches shall not be excavated in existing pavement or paved shoulders to install conduit. When it is necessary to place conduit under an existing pavement, the conduit shall be installed in accordance with Section 756. Unless approved otherwise by the Engineer, no trenches shall remain open after normal work hours each day. All trenches shall be protected from the accumulation of water which might cause an undermining of adjacent structures or utilities. The Contractor shall adequately support all pipes and other structures exposed in trenches.

Before beginning any excavation, the Contractor shall determine the location of any electrical, drainage or utility lines in the vicinity and shall conduct his work in such a manner as to avoid damage to the same. All excavation required for the installation and placement of conduits and other materials shall be performed in such manner as to cause the least possible injury to pavement, curbs or other improvements. All conduits required to be under pavement, sidewalks, etc. shall be in place prior to commencing of base and paving operations. The trenches shall not be excavated wider than necessary for the proper installation of the material. Excavating shall not be performed until immediately before installation of conduit and other appliances. The material from the excavation shall be placed in a position where the least interference with the surface drainage will occur. Should large rocks be encountered in conduit trenches, they shall be removed to a depth of 3 inches {75 mm} below the proposed elevation and replaced with 3 inches {75 mm} layer of suitable material. All suitable material removed from the conduit trenches shall be used in backfilling of the trenches; however, no stone larger than 3 inches {75 mm} shall be in contact with any conduit. All surplus excavated material shall be removed from and disposed of by the Contractor, as directed by the Engineer. Excavations, after backfilling, shall be kept well filled and maintained in a smooth and well drained condition until permanent repairs are made. The Contractor will be required to restore any areas disturbed by his work to their original condition without additional cost to the State.

All encasement shall meet the requirements of Section 756 and the requirements set forth in this proposal. If the Contractor should encounter extraordinary circumstances such as major utilities under existing pavement which the location cannot be accurately determined, he may request in writing permission to open cut a trench in lieu of jacking or boring. This request shall also include a detailed proposed sequence of excavating, backfilling, method of handling of traffic etc. for the Engineer's consideration. No such work shall be performed without written permission of the Engineer.

A pole required for mounting traffic detection equipment shall be installed in accordance with the requirements given in Section 730 and the details shown on the plans. TRAFFIC COUNTING EQUIPMENT 640

731.04Guarantee

The Contractor shall guarantee all work performed under this Section, against defective materials and workmanship for a period of six (6) months after the final acceptance of the project. The Contractor shall replace materials and workmanship found defective during the guarantee period at no cost to the State.

731.05Submittals

The contractor shall transmit Material Submittals in accordance with Subarticle 105.02(d) “Submittals for Traffic Design”. Submittals shall consist of material and equipment listings along with supporting documentation as specified in Item 105.02(d)1 “Preparation of Submittals” and these specifications. Structural components, such as Signal Poles and Luminaire Extension Arms, shall be submitted in accordance with Section 718 and Subarticle 105.02(c) “Working Drawings”. Material Submittals for this specification section “Traffic Counting Equipment” shall be transmitted to the designated Working Group: Design Bureau’s Traffic Engineering Division for their review and approval. The Working Group’s email address is TrafficDesignSubmittals@dot.state.al.us.

731.06Traffic Counting Unit Types

There are several different types of traffic counting units, based on configuration, layout, and equipment. The following are the different types that could be used: Type A: 2-Lane roadway, 1-direction, cabinet & solar panel installed on 12’ pedestal pole, on outside shoulder. Type B: 3-Lane roadway, 1-direction, cabinet & solar panel installed on 12’ pedestal pole, on outside shoulder. Type E: 6-Lane roadway, 2-direction, 3-lanes each direction, cabinet & solar panel installed on 12’ pedestal pole, in median. Type H: 6-Lane roadway w/median barrier wall, 2-direction, 3-lanes each direction, 1-cabinet & solar panel installed on 12’ pedestal pole, for each direction on shoulder. Type K: 4-Lane roadway, 2-direction, 2-lanes each direction, cabinet & solar panel installed on 12’ pedestal pole, in median. Type L: 4-Lane roadway, 2-direction, 2-lanes each direction, cabinet & solar panel installed on 12’ pedestal pole, on outside shoulder. Type R: 2-Lane roadway, 2-direction, 1-lane each direction, cabinet & solar panel installed on 12’ pedestal pole, on shoulder. TypeS: 5-Lane roadway including Two-Way-Left-Turn-Lane (TWLTL), 2-direction, 2 each lane and in TWLTL, cabinet & solar panel installed on 12’ pedestal pole, on shoulder. Type POD: In-roadway sensors each lane, receivers, solar panel, & cabinet installed on pole on the shoulder/median, depending on roadway configuration. Type SFR: Radar head, solar panel, & cabinet installed on pole on the shoulder. Type VID: AI video system with camera, cabinet, and solar panel on pole on the shoulder.

731.07Method of Measurement

Furnishing and installing of traffic counting equipment when so scheduled on the plans or proposal shall be measured in complete units in accordance with the following: Each complete operational traffic counting facility will be measured separately with single locations classified as units. Poles for mounting traffic detection equipment will be measured per each pole.

731.08Basis of Payment

The accepted work of furnishing and installing the traffic counting units measured as noted above, shall be paid for at the contract price bid per each, which shall be full compensation for the furnishing of the traffic counting unit terminal strip enclosure, conduit, encasing, grounding materials, loop wire and sealant, and all incidentals necessary for furnishing in accordance with plan details; and for all tools, equipment, labor to complete the installation. Each pole for mounting traffic detection equipment will be paid for at the contract unit price which shall be full compensation for all materials tools and labor required for the design, fabrication and installation of the pole. The contract unit price shall also be full compensation for the foundation and all appurtenances shown to be required on the plans. Compensation for the pole will be adjusted in accordance with the cost adjustments listed in Section 730.05 for changes to the size of the pole foundation.