619MAINTENANCE OF TRAFFIC

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1This work shall consist of providing and maintaining safe and passable traffic accommodations for public travel; preventing

dust nuisance; and furnishing, erecting and maintaining necessary traffic signs , barricades, lights, signals, delineators, concrete barriers, pavement markings, and other traffic control warning devices and shall include pilot car operations an d other means of guidance of traffic through the work zone. The Contractor shall be responsible for this work and shall perform it in accordance with the current MUTCD, Work Zone Traffic Control Standard Plans, the approved Traffic Control Plan (TCP) and these specifications.

1.2A list showing the permanent construction signs and warning devices will appear in the Contract plans. The Contractor shall

determine the appropriate operational construction signs and warning devices based on the needs of the Contractors daily operation. Materials

2.1Traffic control devices shall conform to the MUTCD and as specified herein. New devices covered by testing and evaluation

criteria in the National Cooperative Highway Research Program (NCHRP) Report 350, titled “ Recommended Procedures for the Safety Performance Evaluation of Highway Features, ” shall also conform to the criteria by the extended compliance dates implemented by the AASHTO -FHWA Agreement (350 Agreement) dated July 1, 1998. A summary of the work zone t raffic control devices categories for new devices to conform with NCHRP Report 350 is provided in t he Special Attention entitled “ Roadside Safety Hardware Worthiness Compliance with NCHRP Report 350 and MASH”. 2.1.1 Base material for permanent constructio n signs shall be weather -proof, rigid substrate specifically manufactured for highway signing and meet the retroreflective sheeting application requirements of the sheeting manufacturer. 2.1.2 Base material for operational construction signs shall conform to 2.1.1, except that flexible base material will be allowed. 2.1.3 Retroreflective sheeting for traffic control devices, including permanent and operational construction signing, shall conform to AASHTO M 268 (ASTM D 4956), Type IV Retroreflecting Sheetin g as a minimum or Type VI for flexible base material. 2.1.3.1 Category I Traffic Control devices (plastic or rubber cones, tubular markers, flexible delineators, and plastic drums, etc.) shall have Type IV or higher sheeting. 2.1.3.2 Orange signs mounted on fixed supports shall be a fluorescent orange color in accordance with Section 718. 2.1.3.3 Sign text shall consist of the letters, digits and symbols either applied by stick -on or silkscreen, to conform with th e dimensions and designs indicated in the Contract, NHDOT Construction Sign Standards, MUTCD or FHWA Standard Highway Signs. The materials and methods shall be in accordance with standard commercial processes. 2.1.3.4 Sign blanks shall be prepared in accordance with current practice as recommended by the sheeting manufacturer. 2.1.4 Supports and posts shall conform to the current AASHTO “ Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals”. 2.1.5 Portable changeable message sign (PCM) shall be capable of up to three lines of display with eight characters per line. Characters shall be a minimum of 18” high. 2.1.6 Trailer mounted speed limit signs shall be self -contained units, including sign assembly, flashing l ights and power supply specifically constructed to operate as a trailer-mounted sign. 2.1.6.1 Sign assembly shall be as shown in the NHDOT Construction Sign Standards. 2.1.6.2 Each unit shall be equipped with two mono -directional flashing lights with amber lenses and reflectors which are visible through a range of 120 degrees when viewed facing the s ign. The lights, LED, halogen or incandescent lamps, shall be visible for a minimum distance of one mile under daylight conditions and shall have a minimum flash rate of 40 flashes per minute. Bulb size shall be in accordance with the MUTCD. An “ ON” indicator light shall be mounted on the back of the signs which is visible for at least 500 ft. to provide confirmation that the flashing lights are operating. 2.1.6.3 Power supply shall be either full battery power with solar panel charging (capable of maintaining a charged battery level) and 135 ampere, 12 volt deep cy cle batteries, or diesel powered generator with a fuel capacity sufficient for 10 hours of continuous operation. 2.1.7 The Contractor shall provide a Certificate of Compliance stating that traffic control devices being provided meet the testing and evaluation criteria of NCHRP Report 350 as implemented by the 350 Agreement. New Hampshire Department of Transportation Standard Specifications – 2016 2.1.8 All category I, II, and III project work zone traffic control devices in use, except portable concrete barrier that transfers tension and moment from segment to segment, shall conform to the testing and evaluation criteria of NCHRP Report 350. Devices not conforming to the criteria shall be replaced with conforming devices at no expense to the Department.

2.2Calcium Chloride shall conform to AASHTO M 144, TypeS, Grade 3.

Construction Requirements

3.1Maintenance of Traffic.

3.1.1 Traffic control devices shall be properl y placed and in operation before starting construction. When work of a progressive nature is involved, such as resurfacing, the appropriate traffic control devices shall be periodically repositioned in the advance warning area. 3.1.2 Whenever the highway is open to public traffic through any part of the project, the Contractor shall provide and maintain sufficient surface for at least one lane of traffic, and two lanes whenever possible. Control of one lane traffic will be re quired at all times. 3.1.2.1 The Contractor shall notify the Engineer at least two weeks prior to beginning work that involves any major disruption of traffic. 3.1.3 Traffic Control devices, either existing or supplied by the Department, shall be maintained at approp riate locations for the use of the traveling public during the construction period. Signs which are not applicable to construction conditions sh all be covered completely with plywood, removed or relocated as necessary. Signs that are removed or relocated shall be retained and re-erected by the Contractor. The Contractor shall notify the Bureau of Traffic when any regulatory sign is removed or relocated. 3.1.3.1 All existing speed limit signs which conflict with the construction zone trailer mounted speed limit signs shall be covered completely as specified in 3.1.3 during the operation of the flashing lights. These signs shall be immediately uncov ered when the use of the flashing lights is discontinued. 3.1.3.2 Devices damaged due to improper handling and storage shall be replaced with new devices. 3.1.4 Dust control shall be performed in an approved manner, generally by the use of water, and shall be continued whenever necessary, even if all other work on the project is suspended. 3.1.4.1 The Engineer wi ll determine when the use of Calcium Chloride is warranted to control dust nuisance. It shall be uniformly applied at a rate sufficient to control dust. 3.1.5 The Contractor may be required to delay or suspend work, as directed, that interferes with traffic during commuting hours, periods of inclement weather, or periods of high traffic volumes which result in excessive backup or create unsafe traffic operations. 3.1.6 For the protection of traffic, equip all vehicles used on the project with amber flashing lights or rotating lights visible from 360 degrees around the vehicle. The flashing light system shall be in continuous operation while the vehicle is on any part of the traveled lanes, shoulders or ramps within the construction zone. 3.1.7 Blank. 3.1.8 Before any suspension of the work, including end of workday, the Contractor shall make passable and shall 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. 3.1.8.1 Pavement authorized for removal for trenching purposes within the traveled way shall be replaced with temporary bituminous material (cold patch or reclaimed asphalt pavement) before the roadway is open to traffic and sh all be replaced with applicable hot bituminous pavement conforming to Division 400 within 72 hours of completed backfill operations. 3.1.9 When the work required as outlined in sectio n 104.03 and 619.3.1.9.1 is completed by the Contractor, the Department will assume the winter maintenance of the roadway during the period of winter suspension without cost to the Contractor. 3.1.9.1 The Contractor shall either remove or relocate all portable concrete barrier to a minimum offset of 6 feet (10 feet desirable) from the traveled way during the winter maintenance season. If the Department’s traffic control plan and/or phase construction plan does not allow for this minimum offset and the snow built up in front of the barrier does not provide safe and passable accommodations to vehicular traffic, the snow accumulated in front of the portable concrete barrier shall be removed by the Contractor. The Contractor shall notify Highway Maintenance prior to performing this work. 3.1.9.2 Prior to October 15 of each year that a Contract is in effect, the Contractor shall restripe the project between “ Road Work 500 Feet” and “ End Road Work” signs. This work will be paid under 632 items. New Hampshire Department of Transportation Standard Specifications – 2016 3.1.10 When work is resumed after any suspension, the Contractor shall replace or renew any work or materials lost or damaged because of such temporary use of the project. 3.1.11 If the Engineer determines that maintenance of traffic and provisions for safe traf fic control are not being provided or maintained by the Contractor, the Department may assume this responsibility and deduct the cost from money due the Contractor. 3.1.12 Any work performed by the Department, either when construction operations are taking place or during periods of suspension, will not invalidate the provisions of the Contract.

3.2Traffic Control Devices.

3.2.1 All traffic control devices supplied to the proje ct shall be acceptable in accordance with the “ Quality Standards for Work Zone Traffic Control Devices ” as published by the American Traffic Safety Services Association (ATSSA) and the retroreflectivity shall be a minimum of 90 percent of new material. 3.2.1.1 At any time during the life of the Contract, including any suspension, any traffic control device that is in an unacceptable condition as described in the “ Quality Standards for Work Zone Traffic Control Devices ” or has a retroreflectivity of less than 70 percent of new material shall be replaced. 3.2.2 Construction signs shall be erected at the locations indicated on the plans or as approved. The posts shall be plumb. The signs shall be installed with the text horizontal. 3.2.3 Traffic control devices shall be erected wherever necessary for the protection of public travel. 3.2.3.1 Trailer mounted speed limit signs shall be used only during the Contractor's actual work hours, unless specifically authorized by the Engineer. Prior to the initial use of the speed limit signs, the Contractor shall submit, for approval, his schedule for use including the time of proposed speed limit reductions. This schedule shall be submitted two weeks in advance of the proposed initial use to allow the Engineer to c ontact the Bureau of Traffic, revise the proposed locations of the speed limit signs, if necessary, and authorize their use. 3.2.3.1.1 The Engineer will record the actual time and location of the signs on a daily basis when the speed limit signs are in use. 3.2.3.2 Trailer mounted speed limit signs shall be located, one on each shoulder, 2,000 feet in advance of the project limits for mainline traffic. A sign shall also be located on the right shoulder 1,500 feet beyond the end of ramp acceleration lanes within the project. Placement of additional “ REMINDER” signs may be ordered by the Engineer. 3.2.4 Operational signs and channelizing devices shall only be set up when weather conditions will allow adequate visibility. 3.2.5 Lighting devices shall be prov ided as required or ordered. The type and number of lighting devices shall conform to the plans and the MUTCD. 3.2.6 Keep all roadway areas that are open to traffic as clear as possible at all times. No materials or Contractor ’s plant and equipment shall be stored on any roadway areas or within the clear zone of the traveled way as specified in the TCP unless protected by portable barrier and specifically approved. Deliver materials to installation areas as needed to provide a continuous installation. 3.2.6.1 Remove all equipment and construction vehicles from the traveled way and within the clear zone of the traveled way as specified in the TCP during non-work hours unless protected by portable barrier and specifically approved. 3.2.6.2 Park workers’ private vehicles close together in a group outside the clear zone of the traveled way as specified in the TCP unless protected by portable barrier and specifically approved. 3.2.6.3 Traffic control devices, including arrow panels, portable changeable message signs and trailer mounted speed limit signs shall be removed outside the clear zone of the traveled way as specified in the Traffic Control Plan when not in use un less protected by portable barrier or equivalent and specifically approved. 3.2.6.4 Trailer mounted traffic control devices, such as arrow panels, portable changeable message signs and trailer mounted speed limit signs shall be delineated with retroreflective temporary traffic control devices while in use. The trailers shall also be delineated by affixing a retroreflective material to them. 3.2.7 Do not conduct any operation (including loading and unloading vehicles) on or near the traveled way without first setting up the proper lane closure and traffic control devices. 3.2.8 All traffic control devices furnished by the Contractor shall remain the property of the Contractor unless otherwise specified and shall be removed at the completion of the project or when no longer required. New Hampshire Department of Transportation Standard Specifications – 2016

3.3Pavement Marking.

3.3.1 Pavement markings shall be used in combination with appropriate traffic control devices to clearly define the required vehicle paths in accordance with the MUTCD. The intended vehicle path shall be clearly defined by pavement markings or channelizing devices or both at the end of the work period. 3.3.1.1 At the end of each day's paving operation on a traveled roadway, pavement markings for centerlines and lanelines shall be applied in accordance with the MUTCD and the Contract requirements. Temporary pavement markings may be used according to the NHDOT Work Zone Traffic Control Standard Plans and MUTCD, after which pavement markings that meet full MUTCD Standards shall be in place. All Temporary pavement markings shall remain in place while in service and if dislodged or rendered ineffective the temporary markings shall be replaced. 3.3.1.2 Temporary raised pavement markings may be used according to the MUTCD or as amended by the Work Zone Traffic Control Standard Plans, in the same color as specified for the markings and installed according to manufacturer recommendations. Temporary raised pavement markers shall not be used to supplement or substitute for edge lines. Temporary raised pavement markers shall be a product listed on the Qualified Products List under the 619 items. 3.3.1.3 Flexible raised pavement markers will not be permitted for use on Interstate or high speed, multi lane highways. 3.3.2 The application of pavement markings and/or removal of existing markings may not be required during daytime construction operations when traffic is controlled by flaggers or uniformed officers and channelizing devices are in place. 3.3.3 In the event that pavement markings are to be applied by the Department, the Contractor shall provide a clean surface and vehicle path free of obstructions. 3.3.4 Pavement markings that are no longer applicable shall be obliterated immediately preceding or following the change in lane usage. Such change in lane usage shall not be implemented until sufficient time, equipment, materials, and personnel are available to completely obliterate the markings. 3.3.5 Removable pavement marking tape shall be removed prior to placing subsequent pavement courses but not until immediately prior to beginning paving operations. Method of Measurement

4.1Maintenance of traffic will be measured as a unit.

4.2Portable changeable message sign and trailer mounted speed limit sign will be measured as a unit. A unit shall consist of the

sign as described, the trailer, fuel and all necessary moves as approved. 4.2.1 Portable changeable message sign (unit/week) and trailer mounted speed sign will be measured as a unit week. A week shall consist of seven consecutive days beginning when the item is first used on the projec t. The number of units required each week will be specified in the Traffic Control Plan or as approved.

4.3The temporary bituminous material required in 3.1.8.1 will not be measured for payment.

Basis of Payment

5.1Maintenance of traffic will be paid f or at the Contract lump sum price. Payment will be made periodically based on the

anticipated construction period. 5.1.1 When the project conditions warrant illumination and such work is not shown on the plans or in the Special Provisions, the cost of furnishing, installing, maintaining (including power) and dismantling the necessary lighting will be paid for as provided in 109.04. 5.1.2 Replacements of any traffic control device required by 3.1.3 or 3.2.1 will be at the Contractor’s expense. 5.1.3 The material cost of calcium chloride will be paid for as provided in 109.04. The labor and equipment necessary for material application will be subsidiary. 5.1.4 The material cost of permanent construction signs ordered but not included in the listing on the Contract plans will be paid for as provided in 109.04. The labor and equipment cost for installation will be paid for as provided in 109.04. 5.1.5 When no provision for Maintenance of Traffic is included in the Contract, this work will be subsidiary. 5.1.6 Unless otherwise provided for in the Contract, the material cost and placement of temporary bitumino us pavement for trench patching will be paid as specified in Section 403 under Item 403.99 Temporary Bituminous Pavement. When Item 403.99 is not included in the Contract, payment will be made at 1.5 times the cost of machine method specified under Section 403. 5.1.6.1 Temporary bituminous material required in 3.1.8.1 is subsidiary to Section 619. New Hampshire Department of Transportation Standard Specifications – 2016 5.1.7 Unless otherwise provided for in the Contract, the material cost and placement of permanent hot bituminous pavement for trench patching will be paid as specified in Section 403 under hand method. When hand method is not specified in the Contract, payment will be made at two times the cost of machine method specified under Section 403. When no Contract items for pavement are specified, payment will be as provided in 109.04. 5.1.8 Work ordered under 3.1.9.1 for snow removal related work will be paid for under Item 1008 Alterations and Additions as Needed – Winter Maintenance, when included in the Contract. 5.1.9 All winter maintenance related work will be paid for under respective Contract items or be subsidiary to Section 619.

5.2Pavement markings, including temporary retroreflective paint pavement markings, will be paid for as provided in 632.5.

5.2.1 Temporary raised pavement markings or temporary removable pavement marking tape required per 3.3.1.2, including maintenance, removal and disposal, will be subsidiary.

5.3Obliteration of pavement markings will be paid for as provided in 632.5.

5.4Work ordered under 3.1.10 that resulted from Department or Municipal maintenance operations will be paid for as provided

in 109.04.

5.5Unless an item is included in the Contract for relocation or removing signs, only the relocation of Type A signs will be paid

for as provided in 109.04. All other signs covered, removed or relocated as provided in 3.1.3 will be subsidiary.

5.6The accepted quantity of portable changeable message signs and trailer mounted speed limit signs will be paid for at the

Contract unit price complete, for each unit used. Payment will be made periodically based on the anticipated need for each unit. 5.6.1 The accepted quantity of portable changeable message sign (unit\week) and trailer mounted speed sign will be paid for at the Contract unit price complete. Payment will be made based on the use for each unit, whether used once or multiple times during a week. Pay items and units:

619.1Maintenance of Traffic Unit

619.25Portable Changeable Message Sign Unit

3 Portable Changeable Message Sign Unit\Week

619.27Trailer Mounted Speed Limit Sign Unit

3 Trailer Mounted Speed Limit Sign Unit\Week

New Hampshire Department of Transportation Standard Specifications – 2016

Description

This work shall consist of furnishing and installing retroreflective delineators with or without posts as shown on the plans.

Materials

Delineator posts shall be flanged channel section ste el conforming to ASTM A 36 posts, galvanized in accordance with

AASHTO M 111. The weight per foot shall be 1. 12 lb. The post shall have 3/8 ” holes drilled or punched, before galvanizi ng, at 1” on center along the center line o f the web, beginning 13/32” from the top and continuing 29” down the post. Post length shall be as shown in the NHDOT Standard Plans or as otherwise shown on the plans. 2.1.1 All deliveries of delineator post shall be accompanied by a certificate of compliance, a certified mill test report, and a detailed bill of lading.

Sheet material for delineators shall be sized to the dimensions and shapes shown on the plans and shall conform to one of the

following: • Aluminum sheeting confor ming to ASTM B 209 , Alloy 6061-T6 when 0.080 ” thick or ASTM B 209 , Alloy 5052-H38 when 0.100” thick, or • Steel conforming to ASTM A 635, galvanized in accordance with AASHTO M 111 (ASTM A 123) with a minimum thickness of 12 gauge, or • For temporary conditions only, high-impact, ultra -violet resistant thermoplastic meeting the following minimum requirements: Property Test method Minimum Property Requirement Tensile Strength@ yield, psi ASTM D 638 5,000 Impact Strength @ 73 °F, Ft. lb/in notch ASTM D 256 10 Impact Strength @ -40 °F, Ft. lb/in notch ASTM D 256 1.5 Flexural strength 1/4” @ 73 °F, psi ASTM D 790 8,000 Flexural modulus1/4” @ 73 °F ASTM D 790 300,000 With a minimum thickness of 0.08”

2.3Retroreflective sheeting shall conform to AASHTO M 268 (ASTM D 4956) mini mum of Type IV sheeting, silver, white,

green, yellow, green or brown.

2.4Bolts for post mounting shall be aluminum alloy economy hexagon head m achine bolts conforming to ASTM F 468 Alloy

6061-T6 supplied with nylon washers and vandal resistant nuts. Bolts for concrete barrier mounting shall be stainless steel hexagon head machine bolt conforming to ASTM A 276 Type 304 with an expansion anchor bolt embedded in the concrete as shown on the plans. Construction Requirements

Steel posts for delineators shall be installed at locations that are in accordance with the NHDOT Standard Plans or as

otherwise shown on the plans. Posts may be set or driven and shall be plumb. Bent or damaged posts shall be replaced. 3.1.1 When posts are set, holes shall be dug to the proper depth. Holes shall be backfilled with suitable material in layers not over 6” in depth and thoroughly compacted. 3.1.2 When posts are driven, a suitable driving cap shall be used. After driving, the top of the posts shall have substantially the same cross sectional dimensions as the body of the post. Posts shall not be dr iven with the assembly attached. 3.1.3 When rock is encountered in erecting posts, the depth to be drilled into the rock and any required grouting shall be determined by the Engineer.

Each retroreflective delineator shall be securely bolted to posts, guardrail or barrier as required.