Type L-4: ACRYLIC PLASTIC CHARACTERS

The letters, numerals, symbols, borders and other features of the sign message shall consist of embossed aluminum frames in which prismatic reflectors are installed so as to be an integral part of the character or otherwise affixed to prevent their displacement in handling or service. Reflectors which are held in the frames by means of tape or adhesive will not be accepted. All items shall be fabricated from 0.040 inch (0.10 mm) sheet aluminum alloy 3003-H14, ASTM B 209. Mounting holes shall be provided within frames to permit the use of screws, rivets, or other common fasteners. The size and spacing of reflector holes shall be such as to afford maximum night legibility and visibility to the finished cut-out figure.

The reflectors shall consist of a clear and transparent plastic face (herein referred to as the lens) and an opaque back fused to the lens (under heat and pressure) around the entire perimeter to form a homogeneous unit permanently sealed against dust, water, and water vapor. The reflector shall be colorless, yellow, or red, as specified. The lens shall consist of a smooth front surface free from projections or indentations other than for identification and a rear surface bearing a prismatic configuration such that it will effect total internal reflection of light. The manufacturer's trademark shall be molded legibly into the face of the lens.

The specific brightness of each reflex reflector intended for use in cut-out letters, symbols, and accessories shall be equal to or exceed the following minimum values with measurements made with reflectors spinning. Five reflectors shall be submitted for test for brightness. Failure of one or more subjected to test shall constitute failure of the lot.

For yellow reflectors the specific brightness minimum shall be 60 percent and for red it shall be 25 percent of the value shown for crystal. The following test shall be used to determine if a reflector is adequately sealed against dust and -water. Submerge five samples in a water bath at room temperature. Subject the submerged samples to a vacuum of 5 inches gage (water) for 5 minutes, then examine them for water intake. Failure of one or more shall constitute failure of the lot. Three reflectors shall be tested for 4 hours in a circulating air oven at 175° F ± 5° (79 t°c ± 3°). The test specimens shall be placed in a

horizontal position on a grid or perforated shelf permitting free air circulation. At the conclusion of the test the samples shall be removed from the oven and permitted to cool in air to room temperature. The samples, after exposure to heat, shall show no significant change in shape and general appearance when compared with unexposed control standards. No failure will be permitted. The assembled cut-out letter, symbol, or accessory shall withstand the combined corrosion test set forth in ASTM B 117.

633.08 Concrete. All concrete shall conform to Section 602 Minor Concrete Structures.

633.09 Reinforcing Steel. Reinforcing steel shall conform to the requirements of Section 554.

Construction Requirements

633.10 Fabrication of Sign Panels. Fabrication of all parts shall be accomplished in a uniform and workmanlike manner. All panel fabrication, including cutting, punching, and drilling of holes, shall be completed prior to final surface preparation and application of reflective sheeting except where required for the fabrication of diecut or sawed letters on processed and mounted signs. Metal panels shall be cut to size and shape and shall be free of buckles, warp, dents, cockles, burrs, and defects resulting from fabrication. The surface of all sign panels shall be flat.

Field drilling of holes in any part of the structural assembly will not be permitted without approval of the Engineer.

(a) Aluminum Panels.-Aluminum sign panels shall be fabricated from standard widths of aluminum sheet. The thickness for panel sizes of 30 inches by 30 inches (762 mm by 762 mm) or smaller shall be 0.080-inch (2.03 mm) and the thickness of larger panels shall be 0.125-inch (3.18 mm) unless otherwise shown on the plans.

The blanks shall be cleaned, degreased, and chromated or otherwise properly prepared in accordance with approved methods recommended by the sheeting manufacturer.

(b) Steel Panels.-The finished plate for the steel panels shall be free of twist or buckle and the background shall be substantially a plane surface. The finished sign panel shall be of continuous coat mill galvanized phosphate coated steel that conforms with Section 633.03(c). The panels shall be cleaned, degreased, or otherwise prepared in accordance with approved methods recommended by the sheeting manufacturer.

(c) Plywood Panels.—The face of the plywood panel shall be abraded and cleaned and degreased in accordance with approved methods recommended by the manufacturer of the reflective sheeting. The edges of the plywood panel shall be properly sealed and the thickness shall be as shown on the plans or as approved by the Engineer.

633.11 Construction of Footings. All excavation shall be performed in accordance with Section 206.

Footings shall be constructed to the details and dimensions shown on the plans or as approved by the Engineer.

633.12 Erection of Sign Supports. Sign supports shall be erected plumb, and in accordance with the details shown on the plans. Lengths of supports will be determined at time of stake out.

633.13 The sign panels shall be securely fastened to the posts as shown on the plans or as specified by the Engineer.

Sign panels shall be mounted with the legend horizontal.

To reduce specular glare the sign panel face shall be erected in accordance with MUTCD, Section 2A-26.

An insulating material 1⁄4-inch (1.59 mm) thick conforming to Military Specification Mil-P-15035, Type FBM, FBG, or FBE shall be placed to prevent contact between aluminum and steel material.

Care shall be exercised during all fabrication, shipping, and erection operations to avoid scratch abrading, and denting of any parts. The structures shall be handled in such a manner as to avoid any damage thereto.

Damaged parts will be repaired or rejected as directed by the Engineer.

Method of Measurement

633.14 Posts. The quantity to be paid for shall be the number of linear feet of posts furnished, erected and accepted, including all hardware, footings, excavation and other incidentals.

633.15 Sign Panels. The quantity to be paid for shall be the square foot area of sign panels shown on plans, furnished, completed and accepted.

Basis of Payment

633.16 The quantities determined as provided above, will be paid for at the contract price per unit of measurement, respectively, for each of the particular pay items listed below that is shown in the bid schedule, which prices and payment shall be full compensation for the work prescribed in this section.

Section 634.-TRAFFIC MARKINGS

Description

634.01 This work shall consist of painting traffic markings on the finished paved area in accordance with these specifications, at the locations and of the dimensions shown on the plans, or as directed by the Engineer.

Details not shown on the plans shall be in conformity with the Manual on Uniform Traffic Control Devices for Streets and Highways, published by the U.S. Department of Transportation, Federal Highway Administration.

Materials

634.02 Paint shall be white or yellow traffic paint or compound suitable for paved surfaces conformed to the requirements of FSS TT-P-115, Type III or TT-P-87. Glass beads shall conform to the requirements of FSS TT-B-1325, Type I.

Construction Requirements

634.03 The area to be painted shall be free of loose particles. This may be done by brooming or other methods acceptable to the Engineer. The markings shall be applied by machine methods acceptable to the Engineer. The paint machine shall be of the spray type capable of satisfactorily applying the paint under pressure with a uniformity of feed through nozzles spraying directly upon the pavement. Each machine shall be capable of applying two separate stripes, either solid or skip, at the same time. Each paint tank shall be equipped with a mechanical agitator. Each nozzle shall be equipped with satisfactory cutoff valves which will apply broken or skip lines automatically. Each nozzle shall have a mechanical bead dispenser that will operate simultaneously with the spray nozzle and distribute the beads in a uniform pattern at the rate specified. Each nozzle shall also be equipped with suitable line guides consisting of metallic shrouds or air blasts.

Stripes shall be 4 inches (102 mm) wide. Broken line segments (Dashed or Skip Traffic Stripe) shall be 15 feet (4.57 m) in length with 25-foot (7.62 m) gaps, or 2 feet (610 mm) in length with 4-foot (1.22 m) gaps as shown on the plans.

Arrows and letters shall be of the dimensions as shown on the plans. The paint shall be thoroughly mixed prior to application, and shall be applied when the air temperature is above 40° F (4 t° c) to a clean and dry surface.

The minimum rate of application for 4-inch (102 mm) width solid traffic stripes shall be 16.5 gallons per mile (62.5 dm3 per 1.609 km). For broken traffic striping the minimum rate of application shall be 6.2 gallons per mile (23.5 dm3 per 1.609 km).

The minimum rate of application for arrows and letters shall be 0.01 gallon per square foot (37.9 cm3 per 0.093 m2) of markings.

Glass beads shall be applied at a minimum rate of 5.5 pounds of beads for each gallon (2.495 kg for each 3.785 dm3) of paint.

The painted area shall be protected from traffic until the paint is thoroughly dry.

All markings shall present a clean cut, uniform and workmanlike appearance. All markings which fail to have a uniform, satisfactory appearance, either day or night, shall be corrected by the Contractor at his expense.

634.04

Method of Measurement

The accepted quantities of traffic markings will be measured as follows:

(a) Linear basis. The quantities to be paid for shall be the number of linear feet of applied traffic stripe markings, measured along the centerline of the road or stripe as outlined below, completed and accepted: Broken traffic stripe shall be measured from end to end of the stripe including gaps.

Solid traffic stripe shall be measured from end to end of each continuous stripe.

The contract unit price bid on each type and color of striping shall be based on striping of a width of 4 inches (102 mm). When striping of a width other than 4 inches (102 mm) is specified in the contract, the measured length of striping will be adjusted in the ratio of the specified width to 4 inches (102 mm).

(b) Square foot basis. The quantities to be paid for shall be the number of applied square feet, surface measurement, of traffic symbols and letters, completed and accepted.

Basis of Payment

634.05 The work under this item will be paid for at the contract unit price for the pay items listed below, which price and payment will be full compensation for furnishing and placing all materials, and for all labor, equipment, tools, and incidentals necessary to complete the work prescribed in this section.

Payment will be made under: