DESCRIPTION
624.01.01 General. This work consists of providing for traffic by constructing detours, using existing streets and
roads as detours permitting traffic to pass through construction, and using flaggers, traffic control supervisor, and pilot cars, or a combination of these methods. MATERIALS
624.02.01 General. The materials shall conform to the MUTCD, if applicable, and the requirements herein.
CONSTRUCTION
624.03.01 General. While undergoing improvements, keep the road open to all traffic unless otherwise
provided for in the contract documents. If the usable roadway is not sufficient to safely accommodate two -way traffic, adequately maintain one- way traffic. Wherever one- way traffic is in eff ect, do not exceed 1,800 m (6,000 ft) distance or as otherwise approved in writing. Provide and maintain in a safe condition, temporary approaches or crossings and intersections with trails, roads, streets, businesses, parking lots, residences, garages and farms. Snow removal, however, will not be required. Bear all expense of maintaining the roadway over the section of road undergoing improvement and of constructing and maintaining such approaches, crossings, intersections, and other features as may be nec essary, without direct compensation, except as provided in Subsection 107.15. Maintain the roadway during suspension of the work when such suspensions are due to the Contractor’s negligence. See Subsection 108.06. During any other suspension, make passabl e and open to traffic such portions of the project and temporary roadways or portions thereof as may be agreed upon between the Contractor and the Engineer for the temporary accommodation of traffic during the anticipated period of suspension. Thereafter, and until an issuance of an order for the resumption of construction operations, the maintenance of the temporary route or line of travel agreed upon will be by and at the expense of the Department. Such maintenance and responsibility will include and be r estricted to the traveled roadway for the convenience of public travel; opening plugged pipes and roadway ditches and drains; or correcting any other hazard which may be detrimental to adjacent property owners or the traveling public. When work is resumed, replace, renew, and repair any work or materials lost or damaged because of such temporary use of the project regardless of the cause of such damage or loss, except as provided in Subsection 107.15. The Department is in no way responsible to maintain the roadway and appurtenances in any certain condition or state of repair. Complete the project in every respect as though its prosecution had been continuous and without interference. Maintain public traffic throughout the project by approved methods. Public traffic includes motor vehicles, bicycles, and pedestrians. Pedestrian access shall be the width of the existing sidewalk and shall be ADA compliant. Allow access and passage of bicycle traffic in the travel lanes where bicycle and motor vehicle traffic m ust share the same lanes. When an approved plan to accomplish this is provided in the contract documents, alternate proposals for handling public traffic through the project may be submitted, and are subject to approval. Furnish alternate proposals containing sufficient detail to determine the appropriate number and placement of traffic control devices. Should approval of an alternate proposal result in additional costs, these costs shall be borne by one of the following:
a.The Contractor, when proposed change is deemed by the Engineer to be for sole benefit of the Contractor .
b.The Department, when the proposal is in the best interest of the Department and/or the traveling public .
c.Both the Contractor and Department, by a negotiated amount, when proposed change is beneficial to both. Consideration will be given to each such proposal and may be rejected, modified, or accepted as deemed best. Do not proceed with any such change in the staging until permission is granted in writing. Rejection of the Contractor’s proposed alternate traffic control plan shall not be considered sufficient cause for additional compensation or an extension of contract time. Provide and maintain in a safe condition temporary access to business and residence driveways, tem porary intersections, and temporary connections with roads, streets, bikeways, sidewalks, and footpaths. For traffic control limitations see Subsection 108.04. 624 ACCOMMODATIONS FOR PUBLIC TRAFFIC Existing speed limits shall remain in effect unless written approval is given by the Department . Comply with all the traffic control requirements shown on the Standard Plans and Traffic Control Plan Sheets. Install and remove all traffic control devices in accordance with the restrictions as specified herein. Initial deployment of construction si gns and traffic control devices on shoulders may not occur more than 24 hours in advance of work activities. The project superintendent shall verify with the Engineer that necessary labor, equipment and materials for the planned work activities are on si te prior to placing traffic control devices. Do not begin placing traffic control devices until necessary labor, equipment and materials are on- site to perform planned work activities. Place work zone traffic control for the anticipated work shift activi ties. Move tapers ahead throughout the shift to ensure that the lag behind work activities does not exceed 1.6 km (1 mi). Adjust speed reduction signs with work zone and cover or remove when no longer appropriate. Upon completion of a specific work activ ity or item as identified in the project schedule, remove traffic control devices from the project roadway and stockpile at an approved staging area if subsequent work is not scheduled in the same project phase, stage, or location within 5 working days (or 7 calendar days for calendar day or completion date projects). In addition, prior to holidays or special events, remove all traffic control devices which no longer apply to existing conditions, as directed. Traffic control devices must be removed from the roadway and stockpiled a minimum of 9 m (30 ft) from the pavement edge at an approved staging area. During non- working hours, place a traffic cone immediately in front of any construction sign that is located within 3 m (10 ft) of the travelway and when ever practical, move the traffic control signs from the plantmix surface onto the gravel shoulder. Place and remove construction signs and traffic control devices daily for striping operations. Stockpile signs and devices a minimum of 9 m (30 ft) from the pavement edge at an approved staging area. Do not remove guideposts until final shouldering- up operation. Install new guideposts within 24 hours of removal. If a guidepost is damaged during preliminary shouldering- up operations, replace it in like kind within 24 hours. Cover “Double Penalty,”“Begin Work Zone,” and “End Work Zone” signs during non- working hours. After presumptive completion of all pay items and at such time as contract time is suspended for final clean up, as defined in Subsections 104.0 5 and 108.09, remove all traffic control devices daily from the roadway and stockpile a minimum of 9 m (30 ft) from the pavement edge at an approved staging area. All traffic control devices necessary for final clean up work shall be placed and removed from the project right -of-way on a daily basis. Failure to comply with any of the requirements specified herein will be considered a traffic control deficiency and subject to the liquidated damages as specified below . If two violations of the traffic control requirements specified herein are observed by the Engineer, work may be suspended. If work is suspende d, submit a written revised construction plan, which addresses the deficiencies. Upon written approval of the plan, the construction operations may resume. Working days, or calendar days, will continue to be assessed during the suspension period. Allow e mergency vehicles immediate passage. Notify police and fire departments having jurisdiction over the project when traffic patterns are to be altered due to construction operations. Give such notification in writing with a copy to the Engineer, and except i n extreme emergencies, submit the notice at least 24 hours in advance of rerouting public traffic. The notification shall set forth the specific traffic patterns to be provided in lieu of normal routing and the estimated duration of such change(s) together with such additional information which will contribute to the general safety of the public as determined. Except as hereinafter provided, maintain access to properties abutting the right of way in a manner closely approximating existing access unless otherwise shown on the plans or directed. When access to private driveways must be temporarily denied due to construction operations such as the installation of storm drains, sidewalks, curbs and gutters, etc., notify the property owner or responsible party of such closure not less than 24 hours in advance of closure. Give the notification in writing and include the estimated duration of the closure. ACCOMMODATIONS FOR PUBLIC TRAFFIC 624 When equipment is crossing or using any portion of the travelled way over which public traffic is directed, cle an up and remove all debris dropped by the equipment at frequent intervals as directed. Notify adjacent residents, homeowners, businesses, and schools along each side of the project limits that are being affected by construction work and disruption of nor mal traffic patterns. Written notification shall be distributed at least 20 days prior to commencing work. The notification shall include, but not be limited to, the approximate work schedule, road closures, detours, delays, suggested alternate routes, and description of traffic control. Submit the notification for approval 7 days prior to distribution. In the event a routine traffic control deficiency, including maintenance of traffic control items, is not corrected within 2 hours after notification, a deduction in the amount of $100.00 per deficiency per device will be made from monies due for each 15 minute increment the deficiency remains , not as a penalty, but as liquidated damages. Failure to address the deficiency may also be cause for withholding progress payments and suspension of work until the issue is resolved.
624.03.02 Detours. Construct detours as shown on the plans or as specified. Exact location will be as staked.
Grading shall consist largely of motor grader work, supplemented where necessary by other mechanical equipment. Grade to provide the specified roadbed width and a grade line free from breaks or rolls of sufficient magnitude to be hazardous to traffic. If required, after the grading has been satisfac torily completed, place surfacing materials of the kind and type specified, by the requirements for the particular materials used. Apply water to detours in amounts necessary to attain compaction of graded sections and surfacing materials. Maintain detours by filling holes as they develop, adding surfacing and applying cutback asphalt, blading, watering, and performing any other work necessary to maintain the detour satisfactorily. Eradicate detours when no longer needed. Eradicate so that the ground will be restored as nearly as feasible to the original condition, and dispose of materials as directed. To request a detour, submit a written request for the establishment of a detour around all or certain designated sections of work. If arrangements for such a detour can be made which are satisfactory to the Department, the Contractor, and the governmental agency having jurisdiction over the road to be used, the road will be designated as a detour, subject to the following conditions:
1.Provi de and maintain the necessary route marking signs.
2.Construct and maintain the detour in good condition. Failure to maintain the detour in such a satisfactory condition, will cause the Department to make such repairs as is deemed suitable and deduct the cost thereof from money due or to become due.
3.When abandoning the detour, obliterate and dispose of such detour and satisfactorily restore as nearly as possible the condition of the ground to its original form.
624.03.0 3 Flaggers. Emplo y flaggers at pl aces as designated. Use additional flaggers, at own expense,
whenever seeing fit to do so. Flaggers shall have completed an approved instructional course in flagger procedures. Prospective flaggers shall possess a valid flagger card attesting that they ha ve satisfactorily completed said instructional course conducted by the Department or some other course approved by the Department. Personnel who attend an approved instructional course in flagger procedures shall be a m inimum of 18 years of age and shall be a ble to clearly communicate. The time required to instruct employees who are proposed flagger candidates will be reimbursed as follows:
a.Attendance must be to a course approved by the Department.
b.Employee must be on the Contractor’s payroll for the hours of reimbursement.
c.Reimbursement will be for the actual instruction period required or a maximum of 4 hours, whichever is less.
d.Reimbursement shall be at the contract unit price bid per hour for flagger. 624 ACCOMMODATIONS FOR PUBLIC TRAFFIC Supply each flagger with an orange or yellow green hard hat and an orange or yellow green soft cap. Use of hard hats is mandatory in any area designated by the Contractor or the Engineer as a hard hat area. Flaggers shall use a combination “STOP” and “SLOW” sign paddle. The paddles shall be a minimum of 450 mm (18 in.) wide, with 150 mm (6 in.) series “C” letters and have a rigid fixed handle approximately 1.5 m (5 ft) in length, from the bottom of the paddle to ground level. Fabricate the combination sign paddle from sheet m etal or other light semirigid material. The background of the “STOP” face shall be red with white letters and border. The background of the “SLOW” face shall be fluorescent orange with black letters and border. Use Type IX or XI reflective sheeting conform ing to Subsection 716.03.01 for the background, letters, and borders on the faces of the Stop/Slow paddles. Adequately illuminate flagger stations at night at own expense. Use flood lights, approved by the Engineer, to illuminate flagger stations. During daytime operations, flaggers shall wear vests meeting Vest Pattern 3 (Performance Class 2) requirements set forth in ANSI/ISEA 107- 2004 “American National Standard for High- Visibility Safety Apparel and Headwear” and the requirements specified herein. During nighttime operations, flaggers shall wear either jackets or coveralls/jumpsuits meeting Performance Class 3 requirements set forth in ANSI/ISEA 107- 2004 and the requirements specified herein. These garments are optional for daytime use. The color of the background material shall be fluorescent yellow -green. Stripes shall consist of retroreflective material of a contrasting color of silver, white, or fluorescent yellow -green. The apparel shall bear the manufacturer’s marking label according to the requirements set forth in ANSI/ISEA 107-2004. Furnish certificates of compliance executed by the manufacturer’s of such high visibility work zone apparel attesting that the garments furnished meet the specifications described herein.
624.03.04 Pilot Cars. Use a pilot car and driver when directed.
Pilot cars shall be suitable vehicles in good mechanical condition and shall carry a sign which complies with the design shown in the “Standard Highway Signs” manual. All pilot car drivers must have a valid flaggin g card.
624.03.05 Equipment Rental. Use equipment rental for incidental construction as directed or as indicated on
the plans. Equip all equipment rented with buckets, scrapers, and other required accessories that do not exceed the power unit manufacturer’s recommended maximum capacity for the particular power unit involved. Equipment shall conform to the following minimum requirements: Motor Grader ................................................................................................................ 75 kW (100 h.p.), Blade Length 4.2 m (14 ft) Loader ........................................................................................................................................................... 3.8 m3 (5 yd3) Capacity Dump Truck ................................ ................................ ....................................................................................... 9 m3 (12 yd3) Struck Rubber -Tired Tractor with Scraper ................................... 215-260 kW (290- 350 h.p.) with Manufacturer’s Rated Capacity Scraper, equip tractor with all necessary accessories to operate scraper Tractor -Crawler with Dozer and/or Ripper ........................ Manufacturer’s Rated 275 kW (370 h.p.), equip tractor with all necessary accessories to operate bulldozer and ripper Elevating Scraper ................................ ................................ ................ 120 kW (160 h.p.), 7.6 m3 (10 yd3) Struck, fully equip with all accessories for scraper operations Backhoe .................................................................................... 60 kW (75 h.p.), equip with front end loader and all necessary back accessories to operate hoe and front end loader Use approved equipment in good operating condition.
624.03.0 6 Traffic Control Supervisor. Designate a traffic control supervisor who shall be responsible for
initiating, installing and maintaining all traffic control devices as shown on the plans, as specified in the MUTCD and these specifications, or as directed. The persons so designated shall have at least one year of experience directly related to worksite traffic cont rol in a supervisory or responsible capacity and shall be certified as a worksite traffic supervisor by ATSSA. Submit the name and qualifications of this person 7 days in advance of the date set for the preconstruction conference in order to review said qu alifications. ACCOMMODATIONS FOR PUBLIC TRAFFIC 624 The traffic control supervisor shall be an employee of the Contractor, under the direct supervision of the Superintendent, and dedicated solely to the contract. The traffic control supervisor shall be available to be contacted by the Engi neer 24 hours a day for the life of this contract and shall be capable of being on- site within 45 minutes of notification. The traffic control supervisor shall make at least 4 inspections of all traffic control devices each day as follows:
1.Before beginning work.
2.At mid -shift.
3.Half an hour after the end of the shift.
4.A minimum of once during the period of non- working hours. The time between inspections shall not exceed 12 hours. The traffic control supervisor shall make a record of each traffic control inspection using the Department furnished "Work Zone Traffic Control Checklist," Form # 040- 056B. Each review shall include traffic control activities, the time the traffic control supervisor reviewed the traffic control, any actions taken, and an y other pertinent information. Submit completed forms within 24 hours. METHOD OF MEASUREMENT
624.04.01 Measurement. Construction, maintenance, and removal of detours will be measured under
appropriate bid items as indicated herein and on the plans. Flaggers will be measured by the number of hours that authorized flaggers are actually used to direct traffic within the right of way limits of the project, or at points where hauling equipment enters and leaves the public traffic stream while hauling from deposits (except commercial sources), outside or within the project limits, as approved. Traffic control supervisor will be measured by the day, for each eligible working day assessed to the contract, not to exceed the number of working days specified in Subsection 108.02, plus or minus any authorized changes. Pilot car will be measured by the number of hours that the pilot car and driver are actually used. Rent equipment will be measured by the number of hours actually used. BASIS OF PAYMENT
624.05.01 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. When a traffic control plan is furnished by the Department as part of the bid documents and the items of flaggers or pilot car do not appear in the proposal, then one or both of these items are deemed necessary, furnish flaggers or pilot cars and payment therefore will be made according to Section 104. Payment will be made under: Pay Item Pay Unit Detours ................................ ....................................................................................................... Appropriate Bid Items or Force Account Flagger ................................ .............................................................................................................................................................. Hour Traffic Control Supervisor ................................................................................................................................................................... Day Pilot Car ................................ ................................ ................................ ................................ ................................ ............................ Hour Rent Equipment (type) ...................................................................................................................................................................... Hour SECTION 625 CONSTRUCTION SIGNS 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.
Source: Nevada Standard Specifications for Road and Bridge Construction, 2014 Edition. Pages 427–432 of 610.