Team Members and Resources
Vince Imhoff-co / Scott Stotlemeyer-mt / Jim Brocksmith-mt / Dan Smith-rd
Kirsten Munck-de / Mary Ridgeway-FHWA / Joe Rickman - tr / Kevin Irving-FHWA

Rationale: Flasher signs, Sec. 612.3.2, were moved to Sec. 902 for signals. Portable barricades, Sec. 612.3.1, were moved to Sec. 616 and permanent barricade signs were moved to Sec. 903. This eliminated all items of existing section 612. Section 612 now covers truck mounted and sand filled impact attenuators for which there was no previous standard specification. The material requirements for the truck mounted and sand filled impact attenuators can be found in Rev. Sec. 1063. All existing special provisions have been incorporated into the standard specification.

4/14/03: EPC made minor changes to Sec 612.4.2.1and approved as revised.

SECTION 612

BARRICADES AND FLASHER SIGNSImpact attenuators

612.1 Description. This work shall consist of furnishing, installing, operating, maintaining, cleaning, relocating, replacing and removing impact attenuators as shown on the plans or as directed by the engineer in accordance with the manufacturer's recommendations.

612.2 Material. All material shall be in accordance with Division 1000, Material Details, and specifically as follows:shown below. Rock salt shall meet the satisfaction of the engineer.

Item / Section

Sand

/ 1005
Retroreflective Sheeting / 1042
Temporary Traffic Control Devices / 1063

Rock salt, when required, shall be of a commercial source meetingmeet the satisfaction of the engineer.

612.3 Safety Requirements. All impact attenuators shall be manufactured specifically for traffic control purposes and shall be in accordance with the MUTCD, NCHRP 350 and any applicable safety and design codes. The contractor shall submit manufacturer’s certification that units supplied comply with crash test requirements of NCHRP 350, Test Level 3 and hashave received FHWA acceptance.

612.4 Construction Requirements.

612.4.1 Truck Mounted Attenuator. A truck mounted attenuator (TMA) shall be used for all moving pavement marking operations conducted under traffic and as specified in the contract. Any Ddamaged TMAs shall be removed from service and either repaired or replaced to the satisfaction of the engineer.

612.4.2 Sand Filled Impact Attenuator. Configuration, location, and relocation and location of the sand filled impact attenuators shall be as shown on the plans. Relocation of the impact attenuators shall be as shown on the plans or as directed by the engineer.

612.4.2.1 Sand shall be measured and placed in accordance with the manufacturer's installation instructions recommendations and weights (masses) shown for each module. The sand shall have a maximum moisture content of five percent at the time of installation. Rock salt shall be Ffive percent of the required sand, by weight (masses), in each module, shall be rock salt, and the rock salt shall be uniformly dispersed in the sand.

612.4.2.2 A decal designed as a Type I object marker with ASTM Type 3 yellow retroreflective sheeting shall be applied to the lead module facing traffic for arrays located 12 feet (3.6 m) or less from the edge of the traveled way.

612.4.2.3 Damaged or deficient modules shall be replaced by the contractor as soon as practicalin accordance with Sec 616.4.

612.4.2.4 When no longer needed, modules and sand shall be removed and emptied of sand. Empty modules in serviceable condition shall become the property of the Commission and shall be delivered and stockpiled as directed by the engineer. Sand and shall remain the property of the contractor.

612.5 Basis of Payment.

612.5.1 Impact attenuators, including relocation, will be paid for at the contract unit price for each of the pay items included in the contract.

612.5.2 Furnishing and installing replacement sand barrels will be paid for at the contract unit price. Final payment for this item will be based on the actual number of modules replaced.

This work shall consist of constructing and maintaining wood fences in accordance with the plans for (1) temporary barricade, with double or single gates, (2) permanent barricade and (3) movable barricade. This work shall also consist of constructing and maintaining flasher signs in accordance with the plans.

612.2 Material. Lumber for barricades and signboards shall be well seasoned, straight and free from serious defects which will materially impair the strength. Posts used for permanent barricades shall be liberally treated with two coats of commercially available creosote or pentachlorophenol solution. The second coat shall be applied after the first coat has been absorbed. Paint for barricades shall be a good quality, commercially available product. Reflective sheeting shall meet the requirements of Sec 1042.2.7.1.

612.3 Construction Requirements.

612.3.1 Barricades. Barricades shall be constructed at locations shown on the plans or as directed by the engineer. The contractor shall provide warning reflectors on the barricades, and shall maintain the reflectors, barricades and signboards in good condition throughout the duration of the contract.

612.3.1.1 Painting and Striping. The surfaces of all wood barricades shall be given a prime coat and a finish coat of white paint, except that portion that is treated with preservative. The surfaces of horizontal boards and panels for all types of barricades that face traffic and extend across the roadbed shall be striped in accordance with the plans. The striping of all barricades shall be provided by the use of reflective sheeting applied by means of an adhesive. Colors, widths and configurations of stripes shall be as shown on the plans.

612.3.1.2 Temporary barricades shall be built with a double gate, and the length of each barricade shall be sufficient to exclude traffic. The contractor shall provide suitable means of entrance through the barricades for persons living within the closed sections of the road who must use the roadway. Temporary barricades shall be relocated if shown on the plans or as directed by the engineer. Any material that is damaged or becomes defective during the process of moving the barricade shall be replaced. Temporary barricades shall become the property of the contractor after their use is no longer required on the project.

612.3.1.3 Movable barricades shall be used as directed and shall become the property of the contractor after their use is no longer required on the project, unless otherwise specified in the contract. Barricades that are to become the property of the Commission shall be left in good condition with respect to repair and paint. Movable barricades that are to become the property of the Commission and those used to support flasher signs shall be constructed as shown on the plans. Movable barricades which are to become the property of the contractor may have alternate supporting frames if approved by the engineer. The alternate frames shall be of such design as to securely hold the horizontal boards in the designated position.

612.3.1.4 Permanent barricades shall become the property of the Commission after the acceptance of the project, and shall be left in good condition with respect to repair and paint.

612.3.2 Flasher Signs. Flasher signs shall be provided at locations shown on the plans or as specified by the engineer. The sign shall be constructed of 3/4 or 5/8-inch (19 or 16 mm), 5-ply, high density type overlaid Douglas Fir plywood. The sign shall be given a prime coat and a finish coat of white paint. The background for the arrow shall be provided by the use of reflective sheeting applied by means of an adhesive. Colors, widths and configurations shall be as shown on the plans. The arrow shall be painted black. Unless otherwise specified in the contract, flasher signs shall become the property of the contractor after their use is no longer required on the project. Flasher signs that are to become the property of the Commission shall be left in good condition with respect to repair and paint.

612.3.2.1 The flasher unit shall consist of a weathertight, self-contained assembly of unit construction type consisting of an 8-inch (200 mm) yellow optical unit with tunnel visor, mounting attachments and other appurtenances. The flashing mechanism shall be controlled by either a synchronous motor or solid state circuitry operated by 110 to 120 VAC. The flashing indications shall be between 50 and 60 flashes per minute with approximately 50 percent on and off periods. The flasher unit shall provide full face illumination and shall be of an intensity which may easily be seen without producing a glare interfering with the visibility of the sign proper. The contractor shall, at no cost to the Commission, provide all necessary connections to a satisfactory power source for the operation of the flasher unit. Flasher signs that are to become the property of the Commission, shall be connected to a permanent power supply.

612.4 Basis of Payment.

612.4.1 The accepted quantities of temporary, movable and permanent barricades will be paid for at the unit price for each of the pay items included in the contract.

612.4.2 The accepted quantity of flasher signs, complete in place, including the cost of power for operation until acceptance of the project will be paid for at the contract unit price. Separate payment will be made for movable barricades required for flasher signs.

612.4.3 Payment for each relocation of temporary barricades will be completely covered by the contract unit price and will include all labor and material necessary for the relocation.

612.4.4 Payment for each relocation of flasher signs will be completely covered by the contract unit price and will include all labor and material necessary for the relocation, and power for operation until acceptance of the project.

612.4.5 No direct payment will be made for relocating movable barricades.

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