SECTION 646 - LED INTERNA LLY ILLUMNINATED SIGNS
646.01 Description. This work consist of furnishing and installing illuminated traffic,
blank-out or street name signs as shown on the plans and set forth herein. This specification addresses the minimum requirements for supplying illuminated traffic, street name signs and blank-out signs for use with span wire and mast arm mounted traffic signal systems.
646.02 Materials.
646.02.1 Illuminated Traffic Signs. Illuminated traffic signs shall be LED internally
illuminated warning or regulatory sign s with a single sided rigid mount.
646.02.1 1--Mechanical Specifications. The outer dimensions of the sign assembly shall
be as shown on the plans, or as specified in the MUTCD, with standard nominal heights of 18” to 36”.
646.02.1 2--Housing. The long edges of the sign shall be made from corrosive resistant
aluminum. The ends caps shall be made from aluminum and shall be affixed to the frame with stainless steel screws. The power supply shall be mounted internally and one (1) end cap shall be removable to enable replacing panels and components. Both the back panel and the sign face panel sh all be securely held inside of the sign’s extruded rails. The sign shall have a front panel that is UV, weather, abrasion and impact resistant. The front panel shall be replaceable so that main taining agencies have the option to supply sheeting and electrocut film for the sign faces. All exterior surfaces of the sign assembly sh all be powder-coat painted in accordance with Military Standard MIL-C-24712. Finish will meet the requirements of ASTM D3359, ASTM D3363, and ASTM D552 No silicone will be used in the weather resistant seal of the sign. The sign enclosure shall have a weatherproof design that ensures water does not reach internal components, and shall be able to do so in its design, without the use of silicone.
646.02.1 3--Rigid Mount. The sign shall rigid mount directly to the signal mast arm or to
a sign mast arm with no moving parts. Sign bracket shall be able to be leveled to accommodate mast arms that are slightly off level. Sign bracket hardware shall mount as per manufacturer’s specifications. The sign will have no holes drilled though the enclosure’s back plate for use in a rigid mount mast arm configuration. Adjustable rigid mount hardware shall securely grasp the top and bottom rails of the sign to provide maximum retention of the sign when installed on the mast arm. The sign shall be supplied with rigid back brace mounting brackets on two (2) positions on the back of the sign. The rigid back brace mounting brackets will be powder-coat painted to an exact match of the sign extrusions and shall be in accordance with Military Standard MIL-C-24712. The finish shall meet the requirements of ASTM D3359, ASTM D3363, and ASTM D552. Approved brackets as per manufacturer’s specifications, shall be used for this installation.
646.02.1 4--Environmental. The sign and power supply shall be field hardened and be
able to withstand extrem e operating temperatures. Signs shall be tested and certified for the following environmental conditions: Exclusion of Water Test Thermal Shock Test Salt Spray Test Strain Relief Test Temperature Test Dielectric Voltage - Withstand Test. Signs shall be UL (Underwriters Laboratories) listed and approved.
646.02.1 5--Structural. The sign shall meet the specifications set forth in the latest edition
of the AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals. The sign sha ll meet the wind requirements set forth in the latest edition of the AASHTO Wind Map.
646.02.1 6--Luminance . The entire surface of the sign panel shall be evenly illuminated
with a minimum average brightness reading at the letters of a minimum of 500 lux.
646.02.1 7--Light Source . The light source for the sign shall be LEDs. The LEDs shall
evenly illuminate a light panel that is the same dimensions of the sign face. The LEDs shall have a minimum projected lifespan of 50,000 hours. The Failure of one (1) LED shall not reduce the light output or cause other LEDs to fail. All LED's shall meet ITE Standards for color and viewing angle and be high in optical power.
646.02.1 8--Energy Requirement . The sign shall be an Ener gy Star Qualified Product.
646.02.1 9--Quality Assurance. Manufacturer shall be ISO 9001:2000 compliant
certified.
646.02.1 10--Elect rical Standards. The sign shall be listed and approved to UL Standards
by a Nationally Recognized Testing Laboratory. LED Single Output Switching Power Supply shall be a fully-encapsulated, constant- current design built to withstand 300VAC surge input for five (5) seconds, with inherent short circuit/over current/over voltage protection. The Power Supply shall be a UL 1310 Class 2 power unit, and will be housed in a fully isolated plastic case to prevent water intrusion. Safety Standards shall meet the following criteria: UL1310 Class 2, CAN/CSA C22.2 No. 223-M91 (for LPC-60-1750 only), IP67 approved; design refer to TUV EN60950-1, EN61347-2-13.
646.02.1 11--Warranty / Guarantee . Sign shall be guaranteed for a minimum of five (5)
years.
646.02.2 Illuminate d Street Name Signs . Illuminated Street Name Signs shall be LED
Internally illuminated signs allowing for single or double sided signs for span wire or rigid mounts.
646.02.2 1--Mechanical Specifications. The outer dimensions of the sign assembly shall
be as shown on the plans with standard nominal heights of 18” to 36”, and standard nominal lengths of 48” to 144”.
646.02.2 2--Housing. The sign housing and finish shall meet the requirements of
Subsection 646.02.1.2.
646.02.2 3--Mounting. For a single-sided underhang sign, the sign shall be supplied with
underhang mounting brackets on two (2) positions on the back of the sign. The mounting bracket shall have a bolt hole pattern to accept manufacturer specified sign hardware. For a double-sided sign, the sign shall be supplied with underhang mounting brackets on two
2.positions on the top of the sign that allows the sign to swing freely. The mounting bracket shall have a bolt hole pattern to accept the manufacturer’s hardware.
646.02.2 4--Environmen tal Specifications. The sign shall meet the requirements of
Subsection 646.02.1.4.
646.02.2 5--Structural. The sign shall meet the requirem ents of Subsection 646.02.1.5.
646.02.2 6--Luminance. The sign shall meet the requirements of Subsection 646.02.1.6.
646.02.2 7--Light Source. The sign shall meet the requir ements of Subsection 646.02.1.7.
646.02.2 8--Energy Requirements . The average power consumption of the sign shall not
exceed 3 – 5 Watts per square foot of viewing area. The sign shall be capable of operating at 120 VAC to 277 VAC. The sign shall be an Energy Star Qualified Product.
646.02.2 9--Electri cal Standards. The sign shall meet the requirements of Subsection
646.02.1 10.
646.02.2 10--Warranty / Guarantee. The sign shall meet the requirement of Subsection
646.02.1 11.
646.02.3 LED Blank-Out Signs . Blank-Out Signs are an alternative to static warning
and regulatory signs to increase visibility, and for creating a safer driving environment. The signs shall conform to Manual on Uniform Traffic Control Devices (MUTCD), latest edition, font and symbol sign standards. In addition enclosures shall meet NEMA 3R standards. The sign shall be capable of displaying one (1) or multiple messages. The messages may be red, amber or bluish/green and be displayed on one (1) side or two (2). The messages shall be formed by single or double rows of LED's.
646.02.3 1--Housing and Mounting . The housing shall be weatherproof and made of
5052-H32 marine-grade aluminum that is 0.125 inch thick. The finish shall be black powder coat unless otherwise specified in the plans. The finish on the sign housing shall be two (2) coats of exterior enamel applie d after surface material is acid-etched and primed with zinc-chromate primer. All corners and seams of one 1- or 2-way housings shall be heli-arc welded to provide a weatherproof seal around the entire case. Continuous full-lengt h stainless steel hinges shall connect the housing and the extruded aluminum door. Window dimension shall be between 24” to 60” wide with a maximum weight of 100 pounds. Door gaskets shall be 3/16-inch x 1-inch neoprene to provide a weatherproof seal. Each door shall be fitted with a sun hood of 0.063-inch aluminum. The standard length shall be six inches (6”). Drainage shall be provided by four (4) drain holes at the corners of the housing. The sign shall rigid mount directly to the signal mast arm or to a sign mast arm with no moving parts. Sign bracket shall be able to be leveled to accommodate mast arms that are slightly off level. The sign shall also be able to mount on span wire.
646.02.3 2--Structural. The sign shall meet the structur al specifications provided in
Subsection 646.02.2.5.
646.02.3 3--Light Source . All messages shall be clearly legible, attracting attention under
any lighting condition. At full intensity, the signal will be highly visible anywhere within a 15 degree cone centered about the optic axis. All LED's shall have an expected lifetime of a minimum of 50,000 hours. LED Modules shall continue to shall continue to operate if one LED goes out. All LED's shall meet ITE Standards for color and viewing angle and be high in optical power.
646.02.3 4--El ectrical. The sign shall be solid state, with a 95 to 125 VAC input, 12 to 15
VDC output, and >95% power factor. The average power consumption of the sign shall be 35 to 105 Watts, varies per message. Transformers shall be used to reduce the incoming 120 volts AC to the design DC voltage. The transformers shall contain Class A insulation and weatherproofing. The sign shall be capable of continuous opera tion over a range in temperatures from -35°F to +165°F.
646.02.3 5--Warranty / Guarantee. All products will be warr anted to be free of defects
due to material and workmanship for a period of two (2) years.
646.03 Construction Requirements. All signs shall be installed in accordance
with the plans and the Manual on Uniform Traffic Control Devices (MUTCD). Signs shall be installed with appropriate mounting brackets an d associated hardware to mast arms, signal poles, or span wire as prescribed above.
646.04 Me thod of Measurement . Illuminated Traffic Sign, Illuminated Street Name
Sign, and LED Blank-Out Sign of the type specified will be measured as a unit per each.
646.05 Basis of Payment . Illuminated Traffic Sign, Illuminated Street Name Sign, and
LED Blank-Out Sign, measured as prescribed ab ove, will be paid for at the contract unit price per each, which price shall be full compensation for furnishing the sign and mounting hardware and installing the same on the span wire, signal pole or mast arm, and for all equipment, tools, labor, and incident als necessary to complete the work. Payment will be made under: 646-A: Illuminated Traffic Sign * - each 646-B: Illuminated Street Name Sign - each 646-C: LED Blank-Out Sign * - each * Additional information may be indicated SECTION 647 - REMOVAL OF EXISTING TRAFFIC SIGNAL EQUIPMENT
647.01 Description . This work consists of removing all existing traffic control equipment
that will no longer be required.
647.02 Blank .
647.03 Construction Requirements . Existing traffic signals, traffic controllers, span
wires, control wires, interconn ect cable, etc. will be removed by the Contractor. Existing traffic signal support poles that are no longer required and have no other utilities attached will be removed. The Contractor shall restore areas disturbed by the removal of the existing equipment to the satisfaction of the Engineer. When salvaged by the State, all removed equipment will be identified by a tag noting its location and date of removal. The Engineer sh all be informed of the items removed, their location and date of removal. Removed it ems will be stored on the project and the Contractor shall notify and coordinate with the State for the return of salvaged traffic signal equipment. Unless otherwise noted in the contract, all loading and hauling of State-salvaged traffic signal equipment will be the responsibility of the State.
647.04 Me thod of Measurement . Removal of existing traffic signal equipment will be
measured as a unit lump sum quantity. Such measurement shall include removal, any required tagging and storing of signal equipment, span wire, interconnect cable, etc.
647.05 Basis of Payment . Removal of existing traffic signal equipment, measured as
prescribed above, will be paid for at the contr act lump sum price, which price shall be full compensation for removal and disassembly of existing traffic signal equipment, for restoration of areas disturbed by removal and for furnishing all equipment, tools, labor and incidentals necessary to complete the work. Section 647 Section 647 Payment will be made under: 647-A: Removal of Existing Traffic Signal Equipment - lump sum SECTION 653 - TRAFFIC AND STREET NAME SIGNS
653.01 Description. This work shall consist of furnishing and installing reflectorized
regulatory and warning traffic signs and street name signs as shown on the plans and set forth herein. This specification addresses the minimum requ irements for supplying traffic and street name signs for use with span wire and mast arm mounted traffic signal systems.
653.02 Materials. All materials for traffic and street name signs shall be new and meet
the requirements of Section 721 of the Standard Specifications.
653.02.1 Reflective Sheeting. Reflective sheeting for traffic and street name signs shall
be Type III or Type VII retroreflective sheeti ng. The type and color of reflective sheeting shall be indicated on the plans or set forth herein. 653.02.2--Sign Blanks. Sign blanks shall be flat aluminum sign blanks constructed of 5052-H38 aluminum alloy. Blanks shall be 0.100 inches thick, degreased, deburred, etched and alodine. Sizes shall be as indicated in th e plans for the specific wa rning, regulatory or street name sign called for and to accommodate the various legends.
653.02.3 Sign Faces. All sign faces shall consist of sheeting material and their legends
applied to aluminum blanks specified herein using a heat vacuum method and/or by silk screening the legends only onto the backings and material. The sheeting shall be applied with legends to one side of each warning, regulatory or street name sign as shown on the plans. The color of all faces shall consist of a refl ectorized yellow, red, green or silver-white background with reflectorized black, red or white legend. The legend shall consist of letters and symbols conforming to the design of warning or regulatory signs as shown in the MUTCD and for street name signs as shown on the plans. All letter sizes spacing shall be in acco rdance with FHWA and the manufacturer's recommendations to insure proper legibility with the increased reflectance.
653.03 Construction Requirements. All signs shall be installed in accordance with the
plans and the Manual on Uniform Traffic Control Devices (MUTCD). Signs are to be tilted in order to minimize or eliminate specular reflection.
653.03.1 Warning and Regulatory Signs. Warning and regulatory signs shall be
installed at locations as noted on the plans with the appropriate mounting bracket and banding material.
653.03.2 Street Name Signs. Street name signs shall be installed at locations as noted on
the plans. If installed on mast arms, they shall be attached with at least two mounting brackets and appropriate banding materials.
Source: Mississippi Standard Specifications for Road and Bridge Construction, 2017 Edition. Pages 647–651 of 1,113.