DESCRIPTION
625.01.01 General. This work consists of furnishing, maintaining, relocating, and removing temporary traffic
control devices and services as ordered for the control and protection of public traffic through the project. This work also consists of rent traffic control devices , which includes designing traffic control plans and furnishing and placing traffic control devices meeting the requirements of this Section and Section 624. MATERIALS
625.02.01 General. Low mass, single piece traffic cones, tubular markers, single piece drums, and delineators
without attachments are considered as Category 1 devices as defined in NCHRP Report 350. Furnish certificates of compliance executed by the manufacturer’s of such Cat egory 1 devices, attesting that they have supporting certification (crash tests and/or engineering analysis) that they meet the evaluation criteria of NCHRP Report 350. Use barricades, portable sign supports, and cones or drums with attachments, which meet National Cooperative Highway Research Program (NCHRP) Report 350 testing criteria for Category 2 Devices, which have been accepted by FHWA, and meet NDOT Specifications. Typically these devices will be the Type I, II, and IIIB barricades, and constructi on signs mounted on portable supports for short -term, short -duration, and mobile conditions. Note that a sign together with its portable support is considered as a system, which together must meet the NCHRP Report 350 requirements. Furnish certificates of compliance executed by the manufacturer’s of such Category 2 devices, even though listed in the QPL. This certification shall attest that the models furnished are the same as the ones tested and accepted by FHWA. Construct sign panels of steel, aluminum, wood, or other approved material of a sound, durable nature. The materials shall be of such quality to do the job for which they are intended and are subject to approval. Repair or replace signs which are dirty, dull, have flaking or peeling reflective sheeting, or are otherwise marred. The traffic drums shall be the two piece plastic break away design type. Close or seal the drums to prevent the ballast from getting wet and freezing. Equip arrow boards to be used at night with a photoelectric sensor for automatic dimming of the lamps during darkness, to a minimum of 50% of their rated lamp voltage. Flexible sign panels that comply with NCHRP Report 350 may also be used provided their support frames hold the panel surface relatively smooth. All signs, barricades, drums, vertical panels, traffic cones, delineators, barricade warning lights, and arrow boards shall also conform to the MUTCD, the Standard Highway Sign Book, including the Nevada Supplement thereto, unless indicated otherwise on the plans or the Special Provisions. All rented traffic control devices will also be subject to being rated for conformance to the current American Traffic Safety Services Association (ATSSA) publication “Quality Standards for Work Zone Traffic Control Devices” which is available from American Traffic Safety Services Association, 5440 Jefferson Davis Highway, Fredericksburg, VA 22407, phone (703) 898- 5400. Replace any device not meeting these quality standards with an acceptable device. Rented portable precast concret e barrier rail shall conform to Sheet R -8.7.1 of the Standard Plans and the applicable requirements of these specifications. Furnish rented portable precast concrete barrier rail with a smooth and uniform appearance. The barrier rail shall be true, straight, and free of lumps, sags, and other irregularities. When a straight edge 3.6 m (12 ft) long is laid on top of the barrier rail, the surface shall not vary more than 6 mm (1/4 in.) from the edge of the straight edge. When a straight edge 3.6 m (12 ft) long is laid along the face of the barrier rail, the surface shall not vary more than 12.5 mm (1/2 in.) from the edge of the straight edge. Allow inspection of the barrier rail prior to delivery. 625 CONSTRUCTION SIGNS
625.02.02 Reflectorization. Reflectorize construction signs, barricades, drums, cones, and vertical panels with
Type IV, Type V, Type VI, Type IX, or Type XI reflective sheeting conforming to Subsection 716.03.01. The orange reflective sheeting used on rigid construction signs shall be Type IX or Type XI fluorescent orange sheeting. The orange reflective sheeting used on roll up construction signs shall be Type VI fluorescent orange sheeting. The orange reflective sheeting used on drums and cones shall be Type IV or better fluorescent orange sheeting. Keep refl ective sheeting on traffic control devices clean. Promptly correct scratches, rips and tears in the sheeting. Maintain sheeting retroreflection of not less than 50% of the minimum Coefficient of Retroreflection values required in Subsection 716.03.01. The markings on the drums shall be horizontal, circumferential, orange and white reflectorized stripes as shown in the Standard Plans. Paint portable precast concrete barrier rail white with paint conforming to Subsection 714.03.03. Place a two way reflector on top and in the center of each portable precast concrete barrier rail section. When using water filled barrier rail, place two way reflectors on top of the rail at a maximum spacing of 6 m (20 ft). Color of the reflectors shall conform to the MUTCD. Us e reflective markers listed in the QPL.
625.02.03 Changeable Message Signs. The changeable message signs shall be transportable truck or trailer
mounted programmable message signs. The message sign boards shall be capable of displaying 3 lines of message text, each with 8 characters of 5 x 7 font of 300 mm (12 in.) minimum height, formed by a bulbtype, LCD, LED, or electromagnetic disk matrix. At nighttime the sign display shall be self illuminated. Program the changeable message signs as instructed by t he Engineer. Supply the Engineer with a programming manual for informational purposes. Use changeable message signs listed in the QPL.
625.02.04 Temporary Impact Attenuators. The temporary impact attenuators shall be approved for speeds
up to the design speed shown in the contract documents. Furnish all manufacturers shop drawings, installation instructions and any other pertinent information before installation. Use temporary impact attenuators listed in the QPL.
625.02.05 Truck- Mounted Impact Attenua tors. Furnish and install the truck -mounted impact attenuators with
all parts and materials necessary for them to perform as designed. Attach the truck -mounted impact attenuators to the back of the trucks according to the manufacturer’s attachment details. Furnish a highway maintenance service type truck of the proper weight and equipped with a Type C arrow board with each truck -mounted impact attenuator. For stationary operations, set the truck’s parking brake and put the transmission in second gear. Equip the truck with shoulder and lap restraint safety belts for both driver and passenger seats. Equip the truck -mounted impact attenuators with rear -mounted black and high intensity yellow chevron stripes and a standard trailer lighting system, including br ake lights, turn signals and 2 yellow rotating beacons mounted on opposite rear corners of the truck at approximately 1.4 m (4.5 ft) from ground level. Keep the truck -mounted impact attenuators bright and clean for maximum visibility. Use truck -mounted i mpact attenuators listed in the QPL. CONSTRUCTION SIGNS 625
625.02.06 Water Filled Barrier Rail. Water filled barrier rail may be substituted for the rented portable precast
concr ete barrier rail required for the contract, when the regulatory speed limit is appropriate and whe n approved. Install the water filled barrier rail in accordance with the manufacturer’s recommendations. Furnish all manufacturer’s shop drawings, installation instructions, and any other pertinent information prior to installation. Properly install the water filled barrier rail and fill with water prior to beginning work in the area protected by the rail. Avoid spillage of water from the water filled barrier rail on the traveled way at all times. Use water filled barrier rail listed in the QPL.
625.02 07 Portable Beacon Light Systems. The flagger stations for stopping traffic at each end of work
zones, which require one way traffic control operations, may be supplemented by the use of a portable beacon light system. Place the beacon light system near the flagger station, outside of traffic flows, and in a visible location. The beacon light system shall have a clear warning beacon strobe light on top, a 200 mm (8 in.) diameter red light for stopping traffic, and a 200 mm (8 in.) diameter yellow light for allowing traffic to proceed with caution. The beacon light system shall have a remote control for the lights’ operation by the flagger at a distance of up to 30 m (100 ft) and operate on a portable 12 volt power supply. The beacon light system shall be portable and lightweight, yet stable under moderate winds and traffic caused wind gusts. The lights shall be mounted on an adjustable support at approximately 3 m (10 ft) from the bottom of the base to the top of the beacon. Manufacturers of portable beacon light systems are listed in the QPL. CONSTRUCTION
625.03.01 General. Place all necessary traffic control devices before any detour or temporary route is opened
to traffic. Install and maintain traffic control devices according to the approved traffic control plan, Nevada Work Zone Traffic Control Handbook, and the MUTCD. Relocate temporary traffic control devices as necessary. Remove devices that no longer apply to the existing conditions. Do not remove any traffic control devices from the project until approved. Immediately after removing guide posts, place and maintain traffic cones at each guide post location until the new guide posts are installed. Traffic cones will not be required at guide posts removed behind guardrail. When a pay item is not provided for traffic cones in the proposal, the cost of furnishing, placing, maintaining, and removing of the traffic cones before installation of the new guide posts shall be considered as included in the price paid for other items of work. Certain signs may require covering during the progress of the work. Covers shall completely block out the message during the day or night. Do not use burlap or similar fabrics. Fasten covers securely to prevent movement by wind action and withstand the effects of weathering. Do not apply adhesive tape to the face of a sign. After completion of construction activities and before final acceptance of this project, provide covers to all project construction signs as directed. Install temporary impact attenuators at locations as shown on the plans according to manufacturer’s recommendations and as directed.
625.03.02 Sign Placement. Place signs in positions where they will convey their messages most effectively
without restricting lateral clearance of sight distanc e. Placement must therefore accommodate highway design and alignment. 625 CONSTRUCTION SIGNS
625.03.03 Sign Supports. Construct signs, posts, and their foundations so as to hold signs rigidly in a proper
and permanent position, and prevent them from swaying in the wind, or fro m being turned or otherwise displaced by irresponsible persons. A portable or removable type of mounting may be used for signs required intermittently or which are frequently moved. Such a mounting shall be heavy enough not to turn over in the wind, and i ts base shall not be appreciably wider than the sign. Use portable sign supports listed in the QPL. Fixed supports for signs shall conform to the requirements for ground mounted sign supports in Section 627 and as shown in the plans for permanent signs.
625.03.04 Barricades. Protect highways closed to traffic by barricades, or portable precast concrete barrier rail
as approved. Provide and maintain appropriate warning and detour signs at all closures, intersections, and along detour routes. Direct the traffic around the closed portions of the highway so that the temporary detour routes are clearly indicated throughout their entire length. Use barricades listed in the QPL. Do not use rocks, asphalt or concrete pieces, construction materials, and other debris as weighting devices for barricades or drums. Sand bags will be permitted as long as a low center of gravity is maintained as approved.
625.03.05 Contractor Designed Traffic Control Plans. Design traffic control conforming to the latest edition
of the MUTCD, the Standard Plans, and as specified herein. Submit four copies of the proposed traffic control plan no later than 7 days before the Preconstruction Conference. The proposed traffic control plan shall be prepared and/or certified as to conformance with the above by a Professional Traffic Operation Engineer (PTOE) or an ATSSA certified Work Site Traffic Supervisor and shall include the PTOE registration number or ATSSA certification number of the certifying person. Failure to submit the traffic control plan within the above time frames will not be justification for delaying the Notice to Proceed nor for additional working days. Failure to adequately address comments in any required resubmittal also will not justify additional working days. For proj ects requiring multi -phase traffic control plans, only the initial phase must be submitted according to the above time frames. However, submit any future phases of the traffic control plans a minimum of 21 days before commencement of that construction phas e to allow for review and resubmittal as necessary. Do not begin construction on any given phase before receiving written acceptance of the traffic control plan for that phase. Any days lost due to improper traffic control will be charged against the allo wable working days. The traffic control plan shall include, but not be limited to the following:
a.Proposed construction zone and existing speed limits.
b.All construction signs, including side streets signing.
c.Types and location of traffic contr ol devices, and a summary of the quantity of devices necessary for each phase.
d.Location of flaggers and uniformed traffic control officers.
e.Temporary striping.
f.Construction phasing (including phasing of intersection construction and detours, if any).
g.Lane cross -overs between construction phases.
h.Method for maintaining traffic signal functions.
i.Special events scheduling.
j.Detours.
k.Private property and business access plans.
l.Accommodation of pedestrian, bicycle, and transit facilities.
m.Lane and shoulder widths. The initial submittal will be reviewed and written comments and/or corrections to the plan, if any, will be provided at the Preconstruction Conference. If necessary, the Contractor and Engineer will meet to consider the comments and/or corrections to the plan at the Preconstruction Conference to resolve any issue relative to the traffic control CONSTRUCTION SIGNS 625 plan. Resubmit the final traffic control plan within 7 days after receipt of review comments to the proposed traffic contr ol plan. Upon resolution of all issues or acceptance of the traffic control plan as submitted, the plan will be accepted in writing by the Department . During construction the Engineer may require revisions to the accepted plan as necessary for safety or accommodation to traffic. Submit in writing, accompanied with drawings, any requests to change the traffic control plan a minimum of 7 days before commencing work. Have the proposed changes to the traffic control plan prepared and/or certified the same as specified herein for the initial traffic control plan. Such request must be accepted in writing before implementation. Additional working days will not be considered for delays associated with review and acceptance of requested changes. Acceptance of the submitted traffic control plan, shall in no way relieve the Contractor of the responsibility for safety requirements. Such acceptance shall in no way be construed as confirmation of the technical accuracy or adequacy of the contents of the plan and shall not relieve the Contractor of the obligation to institute traffic control measures in full compliance with contract requirements, and which function safely and correctly, and are in conformance with applicable statutes, ordinances, and regulations. Within 48 hours after installation of new or modified traffic control, inspect the controls installed in the field to determine if all required controls have been installed and are operating as intended. Submit a signed affidavit stating that the traffic control has been inspected and is found to be in conformance with the accepted traffic control plans and contract requirements. If it is determined that the traffic controls are not in conformance with the accepted traffic control plans or contract requirements, correct immediately. If the accepted controls do not provide a safe and efficient construction zone, recommend revisions to address these deficiencies, in writing. If during the course of construction the traffic control is determined to have been modified or is not functioning as intended, the Contractor may be directed to reevaluate the traffic controls and make revisions as necessary. Submit a draft of residence and business general project information notification letters for approval before distributi on of the notices. Submit a final copy of all written notifications before distribution. Prepare and distribute general project information notices to all residences and businesses adjacent to the project to ensure that residences/businesses receive the notice no less than 7 days before beginning any construction. The notice shall include the following:
a.General scope of project (description of project and limits, hours and days of operation, phasing information, lane closure, parking restrictions, et c.).
b.Access plans.
c.Contractor contact and telephone number.
d.Other appropriate information requested by the Engineer. In addition to the general project information notices, prepare written notification of commencement of construction on any ne w segment of the street. Distribute these notices to adjacent residences/businesses within the new construction segment a minimum of 2 working days before commencing work in the new street segment. Submit a draft of the notice for acceptance before distribution. Upon approval of the traffic control plan, and not less than 2 working days before beginning construction, notify local police and fire departments and any other emergency service of the upcoming construction. During the course of construction, be prepared to provide access through the construction zone for police, fire or emergency vehicles which otherwise do not have through access due to traffic tie- ups and the inability to pass without entering the construction zone. Do not proceed with any co nstruction until traffic control plans have been accepted and the proper traffic control has been provided. Design and construct any detours, lane crossovers, or other appurtenances which are required for the implementation of the traffic control plan. Remove these same detours and appurtenances and restore the area to original condition or better upon completion of the work which originally required them. The cost of this design, construction, removal and restoration shall be included in the contract pric e for the Rent Traffic Control Devices pay item and no additional compensation will be allowed therefore. Contact and obtain written approval from the owner of any lands on which a detour is proposed, before implementation of said detour. 625 CONSTRUCTION SIGNS Provide flaggers or signals at intersections within the construction zone to direct traffic movements at all times during construction at the intersections. During non- working hours, control the intersection with normal signal pattern or by some other approved method. Coor dinate with and secure approval from the appropriate agencies for any use of or changes to operation of existing traffic signal equipment in the traffic control plan operation. On occasions when flagger control is necessary for safety or efficient traffic flow within signalized intersections, turn the signal off. Do not use the flaggers to control the intersection with the signal in operation. If flaggers enter the intersection to control traffic, equip them with proper attire and control devices. The number of flaggers and equipment/attire shall comply with applicable MUTCD, State, and local requirements. Illuminate flagger stations at night from the vehicle approach direction. Whenever operations create a condition hazardous to traffic or to the public, f urnish such devices as are necessary to give adequate warning to the public of any dangerous conditions to be encountered. Furnish, erect, and maintain such fences, barricades, lights, signs, channelization devices, temporary pavement striping, arrow boards, detours, and other devices as are necessary to prevent accidents and avoid damage or injury to the public until all permanent traffic control striping, signs and devices are installed and operational and the project is accepted. If after notification of hazardous traffic conditions and failure to furnish and/or maintain warning and protective devices as required, the State may furnish and/or maintain such devices and charge the Contractor by deducting the cost thereof from periodic progress payments due the Contractor as such costs are incurred by the State. Do not use Type I or Type II barricades to prevent vehicle traffic from entering a closed portion of roadway. Use only Type IIIB barricades in all such instances. Place Type IIIB barricades used for this purpose a maximum 1.2 m (4 ft) apart. Yellow warning lights may be necessary for some barricade or drum applications. Delineate and sign all longitudinal drop- offs greater than 25 mm (1 in.) exposed to public traffic. Protect public traffic from longitudinal drop- offs greater than 100 mm (4 in.) with an approved barrier or construct and maintain approved 1:6 (6:1) maximum safety slopes. In areas with pedestrian traffic, use fencing around open trenches. The fencing may be placed on top of portable concrete barrier rails. Maintain a minimum of 12 foot lanes and 2 foot shoulders unless otherwise approved. Use temporary painted striping, striping tape, or reflective lane line markers to delineate temporary traffic lanes or mark other required patterns or symbols. Temporary painted striping may only be used on pavement which is to be replaced or overlaid as part of the contract. Temporary painted striping shall conform to Section 636. Temporary striping tape shall conform to Section 635. Temporary reflective lane line markers shall conform to Section 633. Effectively remove, at no direct payment, any existing lines or markings of paint, tape, film, or pavement markers that conflict with the required temporary lines. Remove such lines in a manner so as to leave no residue or other trace of the former line that may be misconstrued by a driver to be a traffic line under any condition of daylight, darkness, or wetness of pavement. METHOD OF MEASUREMENT
625.04.01 Measurement. Construction signs will be measured for rental by the square meter (square foot) of
sign surface. Traffic cones, drums, barricades, barricade warning lights, arrow boards, and vertical panels will be measured for rental by the each. Portable precast concrete barrier rail and water filled barrier rail will be measured for rental by the linear meter (linear foot). The quantity of barrier rail shown on the contract proposal is deemed sufficient for the construction of this project. If electing to stage construction so as to require a dditional barrier rail, furnish and place said additional rail with no additional compensation. CONSTRUCTION SIGNS 625 Barrier rail will be measured for payment one time only and that movement to another location will not be grounds for remeasurement. However, should additional lengths be required over and above the length first measured, such additional lengths will be measured for payment. Changeable message signs will be measured for rental by the each or day. Temporary impact attenuators will be measured for rental by the each. Truck -mounted impact attenuators will be measured for rental by the each or day, including the truck with arrow board. Only the quantity and type of traffic control devices shown in the proposal which are ordered or approved in writing for delivery to the project will be measured for payment. Such order or approval will not be given until after providing the proposed method of operation. Rent traffic control devices will be measured by the lump sum, which includes furnishing a traffic control plan, providing flaggers, pilot cars, traffic control supervisors, or constructing, maintaining and removing detours, furnishing and installing all construction signs, traffic cones, traffic drums, vertical panels, removal of striping, temporary pavement stripin g, barricades, barricade warning lights, arrow boards, impact attenuators, changeable message signs, barrier rail, or other traffic control and safety devices not listed as separate bid items in the proposal. BASIS OF PAYMENT
625.05.01 Payment. The accepted quantities, measured as provided above, will be paid for at the contract
price per unit of measurement for the pay items listed below that are shown in the proposal. Payment will be full compensation for the work prescribed in this Section. Partial payment for rent traffic control devices will be made according to Subsection 109.06. Signs which have been measured for payment as set forth in Subsection 625.04.01 but were not erected will be paid at the rate of 60% of the contract unit price bid. Moving traffic control devices from one location to another on the contract, as directed, shall be considered necessary and essential and no additional compensation will be allowed therefore. No additional compensation will be allowed for rent traffic control devices by the lump sum, unless a bid item requiring traffic control qualifies as having a “significant change” in the character of work as specified in Section 104. In such cases the payment for extra work for traffic control will be determined accor ding to Section 109. Payment will be made under: Pay Item Pay Unit Rent Construction Signs ................................ ................................ ................................................................ Square Meter (Square Foot) Rent Construction Barricades (type) ................................ .................................................................................................................. Each Rent Portable Precast Concrete Barrier Rail .................................................................................................... Linear Meter (Linear Foot) Rent Water Filled Barrier Rail ................................ ................................ ................................ ........................... Linear Meter (Linear Foot) Rent Traffic Cones ............................................................................................................................................................................ Each Rent Barricade Warning Lights (type) ................................................................................................................................................ Each Rent Arrow Board (type) ................................ ................................ ........................................................................................ Each or Day Rent Traffic Drums ............................................................................................................................................................................ Each Rent Vertical Panels ................................ ................................ .......................................................................................................... Each Rent Changeable Message Signs ......................................................................................................................................... Each or Day Rent Temporary Impact Attenuators ................................ ................................ .................................................................................. Each Rent Truck -Mounted Impact Attenuators ............................................................................................................................... Each or Day Rent Traffic Control Devices ..................................................................................................................................................... Lump Sum SECTION 627 PERMANENT SIGNS DESCRIPTION
627.01.01 General. This work consists of furnishing, erecting , and installing signs, sign supports , and other
materials required for highway signs.
627.01.02 Shop Drawings. Furnish 5 sets of shop drawings for each overhead sign structure for approval.
Do not fabricate overhead sign structures until the shop drawings have been approved. For signs which are shown on the sign summary sheets and are not included in the Standard Highway Sign Book or the Nevada Supplement, the Department will furnish special sign design sheets. Fabricate these signs to conform to the special sign design sheets as well as the drawings noted in the plans. MATERIALS
627.02.01 General. Material shall conform to the MUTCD, the Standar d Highway Signs (FHWA), the Standard
Highway Signs (Nevada Supplement), and the following Section: Sign Materials ................................ ................................ ........................................................................................................ Section 716 Sign panels of sizes 900 mm by 900 mm (36 in. by 36 in.) or smaller, which are mounted on a single post, may be constructed of ultraviolet resistant engineered thermoplastic. Manufacturers of thermoplastic sign panels are listed in the QPL.
627.02.02 Reflectorization. Use Type IV, IX, or XI reflective sheeting material for regulatory and ground
mounted guide sign installations . Use Type IV reflective sheeting for background material and Type IX or XI reflective sheeting for legend on overhead guide sign installations. Use Type IX or XI fluorescent reflective sheeting for warning sign installations. Reflectorized signs made o f molded thermoplastic material shall meet the requirements for Type IV reflective sheeting. Overlay acrylic EC films and inks used for assembly shall be approved for use by the manufacturer of the sheeting material. Use only acrylic EC film to achieve color. The service life of inks and films shall be comparable to the sheeting used. All letters, numerals, symbols, borders, and accessories as necessary for the sign legend shall be directly applied to the sign background or molded to form an integral si gn legend and background on all signs. CONSTRUCTION
627.03.01 Panel Fastenings. Provide the panel sections with suitable fastenings, as shown on the plans, to
permit easy attachment to the supporting frames. Provide panel sections with closure strips at the joints. Panel fastenings shall utilize nylon washers for contact between the reflective sheeting and the metal washer. Pre-paint the exposed portion of fastening hardware on the face of the sign panels with baked enamel or use a commercial quality pre-painted fastener to match the sign face.
627.03.02 Closure Strips. Closure strips are required on aluminum sign panels. Anchor closure strip by
aluminum rivets or approved alternate, colored to match the sign face.
Source: Nevada Standard Specifications for Road and Bridge Construction, 2014 Edition. Pages 433–440 of 610.