417HIGHWAY SIGNS

- 221 - SECTION 417 -- HIGHWAY SIGNS

417.01Description

provide, fabricate, and install highwa y signs at the locations shown in the contract.

417.02Material Requirements

Traffic Control Devices for Streets and Highways .

signs composed of a flat aluminum sheet background surfaced with retroreflective sheeting and the message either directly applied or reverse screened on the sign face, all in the colors specified in the contract. Bridge and hazard markers shall be classified as a Type A sign.

along the roadside or on overhead structures and constructed of molded extruded panels or reinforced aluminum, horizontally joined panels with retroreflective sign sheeting and direct applied letters, numerals, symbols, and borders.

on overhead structures and construc ted of molded extruded panels or reinforced aluminum, horizontally joined panels sheeted with retroreflective sign sheeting and direct applied letters , numerals, symbols, and borders.

from aluminum, steel, or wood as indicated in the contract.

roadside as shown in the contract and supported by structural steel beam breakaway posts with the post stub extending into round, reinforced concrete footings.

roadway on sign structures, including cantilever structures, with vertical supports installed on reinforced concrete foundations or on sign brackets attached to existing roadway bridges.

requirements of ASTM D 4956 Type IV.

requirements of ASTM D 4956 Type XI.

requirements of Section 1002.

complete design drawings for Type B and C signs for approval. These shall include 6 sets of prints and drawings on half size plan sheets (11 x 17 inches [297 x 420 mm]) prepared and signed by a registered Professional Engineer licensed in Nebraska.

417.03Highway Signs

- 222 - 417.03 -- Construction Methods

sheeting on both Type A, B, and C signs as follows:

alkaline cleaning system.

by one of the following methods:

saturated vapor of trichlorethylene or perchlorethylene.

containing alkaline solutions, controlled and titrated to the solution manufacturer's specifications. Immersi on time shall depend upon the amount of soil present. Metal shall be rinsed thoroughly with running water.

etched in a 6 to 8% phosphoric acid etching solution at 100°F (38 °C).

running cold water.

forced hot air drier shall be used to dry the panels.

mechanical device or clean canvas gloves between all cleaning and etching operations and the application of reflective sheeting. There shall be no opportunity for metal to contact greases, oils, or other contaminants before the appl ication of reflective sheeting.

treated base panels using the sheeting manufacturer's recommended procedures and equipment.

visible seams or joints.

color at the time of sign fabrication to provide uniform appearance and brilliance, both day and night.

panels is not properly matched will be rejected.

sheeting to the sign surface shall be strong enough to resist stripping from the panel when tested with a stiff putty knife. .03

- 223 - 3. The message, legend, and border of Type A signs shall be applied by one of two processes, depending on the kind of sign.

message, legend, and border color on the face of the sign by the silk screen process.

be obtained shall be as recommended by the manufacturer of the reflective sheeting.

shall be as shown in the contract.

opaque or transparent color over the sign face to form the legend and border.

used and the dry film thickness to be obtained shall be as recommended by the manufacturer of the reflective sheeting.

shown in the contract.

width specified in the contract.

in the sequence shown in the contract for each sign.

sign face, and the face of the panels shall be in the same plane on the sign face.

and in line. The ends shall be free from burrs.

contract.

be directly applied.

panel face with self-plugging type rivets, 1/8 inch (3 mm) in diameter and of all aluminum construction, when they cannot be directly applied.

manufacturer for the combined thickness of each legend material and the structural panels to which they are applied.

Highway Signs

- 224 - (2) After a rivet is set, the st em, if remaining, shall be trimmed flush with the rivet head in a manner recommended by the rivet manufacturer.

pavement) the location of each sign and will also establish the elevation of the edge of the roadway if it does not exist.

the sign which is adjacent to a roadwa y will be 2 feet (600 mm) outside of the curb where there is a barrier type curb.

be at least 35 feet (10.7 m) from the edge of the r oadway, excluding exit gore signs.

least 30 feet (9.1 m) from the edge of the roadway, excluding exit gore signs.

shall be at least 30 feet (9.1 m) from t he edge of the roadway, excluding exit gore signs.

and positioned as shown in the contract. On curved alignments, the angle of placement should be determined by the course of approaching traffic rather than by the roadway edge at the point where the sign is located.

bolts as described in Section 1071.

accordance with the recommendations of the extrusheet panel manufacturer. All supports shall be cu t off flush with the top of the sign.

to provide a breakaway feature.

posts in accordance with Section 708.

fabrication.

the job site to avoid deformation of the pre-cut post in shipping.

repaired in accordance with Method 2 of Section 1061.

the post. .04

- 225 - (7) The fuse plate bolt shall be tightened by the turn-of-the-nut method described in Subsection 708.03. The base connection assembly shall follow the procedure outlined in the contract which shall include rechecking the torques until all bolts in the base have the described torque. This procedure shall be repeated immedi ately preceding the final inspection of the project.

breakaway posts shall be concrete.

diameter and depth shown in the contract.

placed so the posts are plumb and correctly spaced.

above the ground to prevent snagging.

applicable requirements of Se ctions 702, 704, and 707.

the bottom of all signs shall have the same elevation so they will be horizontally aligned with each other. All signs shall be hung at a minimum of 2 feet (600 mm) above the sign support walkway. Sign posts and vertical supports used as sign stiffeners shall be cut off flush with the top of the sign.

417.04Method of Measurement

be measured by the square foot (m2).

Type B signs shall be measured by the pound (Kg) of unplated, unwelded, and undrilled steel. The pounds (Kg) of st eel shall be the weight per foot (m) multiplied by the length of signs upport above the stub post required at each location. Connection shall be subsidiary to this item.

Type B signs shall be measured for payment by the linear foot (meter). The quantity to be paid for shall be the actual support length used or as ordered by the Engineer.

breakaway post for Type A and B signs will be measured by the each for each post.

417.05Highway Signs

- 226 - 417.05 -- Basis of Payment

Type A Sign Square Foot (SF) [Square Meter (m2)] )] Type B Sign Square Foot (SF) [Square Meter (m2)] Type C Sign Square Foot (SF) [Square Meter (m2)] Install Type A Sign Square Foot (SF) [Square Meter (m2)] Install Type B Sign Square Foot (SF) [Square Meter (m2)] Install Type C Sign Square Foot (SF) [Square Meter (m2)] Structural Steel for Sign Suppo rts Pound (lb) [Kilogram (kg)] 4 x 4 Inch Wood Sign Support Linear Foot (LF) [Meter (m)] 4 x 6 Inch Wood Sign Support Linear Foot (LF) [Meter (m)] _____ Sign Support Footing Each (ea) 2. Furnishing and installing 40 inch (1 m) long stub posts and the required reinforcing steel shall be subsidiary to the "_____ Sign Support Footing".

relevant pay item.

- 227 - SECTION 418 -- OVERHEAD SIGN SUPPORTS

418.01Description

supports.

as shown in the contract (including attachment of sign brackets to the structure).

designs of the overhead sign support structure. Steel cantilever and steel truss or aluminum box truss structures shall be manufacturer-designed. Bridge brackets shall comply with the design provided in the contract.

the sign support.

vertical end supports of the sign structure when the foundation is located in the median and will requir e impact attenuators.

soil borings taken from the location of each overhead sign support. Soil borings, soil analysis, and foundation design must be performed by individuals proficient in that line of work.

Geotechnical Engineering Reports showin g the soil analysis of the borings taken at each of the sign support locations, eight (8) complete 1/2 size sets of plans of the foundation design drawings, and eight (8) complete sets of reports on the foundation design computations to the Engineer for review.

must be signed and stamped by a regist ered Professional Engineer licensed in Nebraska. Acceptance of the foundation design(s) by the Department will be based upon this seal and signature.

when shown in the contract, shall be provided with a sign lighting system in accordance with Sections 401 through 412.

with the horizontal member overhanging the roadway and shoulder.

bridges spanning the roadway and when shown in the contract, shall be provided with a sign lighting system in accordance with Sections 401 through 412.

drawings submitted in accordance with Subsection 105.02.

single panel truss structures.