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contrast tapes and black masking tapes must be non-reflective and have a reflectance of less than 5 mcd/lx m2 . At the end of the six month service life, the retroreflectance of white and yellow removable tape shall not be less than 150 mcd/lx9m2 . 10240 .3 .4 Removability : Provide removable tape capable of being removed from bituminous concrete and portland cement concrete pavement intact or in substantially large strips , either manually or by a mechanical roll-up device, at temperatures above 40°F , without the use of heat, solvents, grinding or blasting . 10240 .4 Temporary Retroreflective Pavement Markers (RPM ' s) : Use markers listed on the QPL and meeting the requirements of 990 - 5 . Apply all markers in accordance with the Design Standards , Index No . 600 , prior to opening the road to traffic . Replace markers any time after installation when more than three consecutive markers fail or are missing, at no expense to the Department, in a timely manner, as directed by the Engineer. 10241 Method of Measurement. 10241 . 1 General : Devices installed/used on the project on any calendar day or portion thereof, within the allowable Contract Time , including time extensions which may be granted, will be paid for at the Contract unit price for the applicable pay item, except those paid for as Lump Sum . 102- 11 . 2 Traffic Control Officers : The quantity to be paid for will be at the Contract unit price per hour (4 hour minimum) for the actual number of officers certified to be on the project site, including any law enforcement vehicle(s) and all other direct and indirect costs . Payment will be made only for those traffic control officers specified in the Plans and authorized by the Engineer. 102- 11 .3 Special Detours : When a detour facility is specifically detailed in the plans , or is otherwise described or detailed as a special item , and an item for separate payment is included in the proposal, the work of constructing, maintaining, and subsequently removing such detour facilities will be paid for separately. Traffic control devices , warning devices , barriers , signing, and pavement markings for Special Detours will also be paid for separately. When the plans show more than one detour, each detour will be paid for separately, at the Contract lump sum price for each . Where a separate item for a specific detour facility is included in the proposal, payment will be made under Special Detour. 102 - 11 .4 Commercial Material for Driveway Maintenance : The quantity to be paid for will be the certified volume, in cubic yards , of all materials authorized by the Engineer, acceptably placed and maintained for driveway maintenance . The volume, which is authorized to be reused, and which is acceptably salvaged, placed, and maintained in other designated driveways will be included again for payment . 10241 . 5 Work Zone Signs : The number of temporary post-mounted signs (Temporary Regulatory, Warning and Guide) certified as installed/used on the project will be paid for at the Contract unit price for Work Zone Signs . When multiple signs are located on single or multiple post(s) , each sign panel will be paid individually. Signs greater than 20 ft2 and detailed in the plans will be paid for under Lump Sum MOT . Temporary portable signs (excluding Mesh signs) and Vehicular Mounted Signs will be included for payment under work zone signs , only if used in accordance with the Design Standards . 10241 . 6 . Business Signs : The number of business signs certified as installed/used on the project will be paid for at the Contract unit price for Business Signs . - 32 - FPID ( S ) : 423186 - 1 - 58 - 01 , Y