SECTION 645 - SIGNS (Last Revised September 2021)
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3
645-1 DESCRIPTION. This work shall consist of fabricating, installing and covering traffic sign
panels, sign support systems, sign posts, and illuminated sign panels in accordance with the contract documents, standard sheets, the MUTCD and as directed by the Engineer.
645-1.01 Definitions. The following definitions shall apply to all work equipment and materials included
under this section:
645-2 Materials
645-2.01 General. Materials shall meet the requirements of the following subsections of Section 700
Materials and Manufacturing: Wood Preservative - Water Borne 708-31 Stress Graded Timber and Lumber 712-14 Stainless Steel Connecting Products 715-16 Rubber Impregnated Woven Cotton-Polyester Fabric 728-01 Rubber Impregnated Random Fiber Pad 728-02 Aluminum Sign Panels 730-01 Retro-Reflective Sign Sheeting 730-05 Stiffeners, Overhead Brackets, and Miscellaneous Hardware 730-22 Fiberglass Reinforced Plastic Sign Panels 730-23 Type A Sign Supports 730-24 Type B Sign Posts 730-25 Breakaway Bases and Hinge Assemblies 730-26 U-Bolts ASTM F1554, Grade 36
645-2.02 Sign Panels.
Fabricate sign panels in strict accordance with Department Standard Sheets and the sign sheeting manufacturer’s guidelines, to ensure uniform appearance and brilliance, under both nighttime and daytime conditions. Fabricate sign panels in a manner to provide an even, clear, uniform surface, free of streaks, drips or other defects which might affect appearance or retro-reflectivity. Details for signs that are not shown on the standard sheets shall be similar to the closest shown sign blank size. Holes on panels may be punched or drilled. Edges shall be smooth and true and free from burrs or ragged breaks. Coat and/or edge seal all backgrounds, characters, delineators, etc., in accordance with the sheeting manufacturer’s recommendations.
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3 Clearly mark all sign panels in the lower right corner on the back of the sign panel to show the Contract Number and the installation date (month/year). Markings shall be a minimum of 1 inch high and shall be permanently engraved, labels attached with pre ssure-sensitive adhesives, marked with an indelible ink or paint, or established by another method approved by the Engineer. Mounting Hardware: U-Bolts used to attach sign panels to overhead sign structures shall be Type II galvanized in accordance with §719-01 Galvanized Coatings and Repair Methods.
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3
645-2.03 Type A and High -Capacity Type A Sign Posts. Type A sign posts shall be selected from the
Department's Approved List of Type A Sign Supports. The standard strength (i.e., moment capacity) of a Type A sign post shall be 2100 ft-lbs., although weaker or stronger posts may be substituted.
645-2.04 Type B Sign Posts. Type B sign posts shall be fabricated in accordance with the requirements
of '730-25 Type B Sign Posts.
645-2.05 Concrete Foundations. Cast-in-place concrete for foundations shall be Performance
Engineered Mixture (PEM) Portland Cement Concrete that meets the appropriate mix design requirements specified in Table 2 of Materials Procedure (MP) 501-2 Mix Design and Approval
645-2 06
NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3 Procedure for Performance Engineered Mixtures – Structural Concrete. Precast concrete foundations shall meet the requirements of '704-06 Precast Concrete Cribbing.
645-2.06 Breakaway Wooden Sign Posts. Breakaway wooden sign posts shall be either Grade 2
Southern Yellow Pine or Grade 2 Douglas Fir-Larch, surfaced four side (S4S) as designated by the National Design Specification (NDS) for Wood Construction, and meeting the requirements of '712-14 Stress Graded Timber and Lumber. The bending stress (Modulus of Rupture) shall not be less than 3900 psi using the clear wood properties of ASTM D2555. Posts shall be pressure treated in accordance with '708-31 Wood Preservative - Water Borne, dried to a maximum moisture content of 15% before and after pressure treating. The embedded portion of each post shall be sealed to 2 inches above the ground surface or above the steel tube insert, with a heavy coat (12 mil dry film thickness) of an emulsified asphalt conforming to AASHTO M140. All 3 1/2 inch x 5 1/2 inch posts shall have two 1 1/2 inch diameter breakaway holes drilled through the center of the post parallel to the sign face 4 inches and 18 inches above grade and filled with flexible caulk. All 5 1/2 inch x 7 1/2 inch posts shall have two 3 inch diameter breakaway holes drilled through the center of the post parallel to the sign face 4 inches and 18 inches above grade and filled with flexible caulk. Nails and fasteners shall be stainless steel meeting the requirements of '715-16. Cuts and holes made at the contract site shall be field treated with copper naphthenate having a minimum 2% metallic solution, in accordance with AWPA Standard M4. Breakaway holes shall be field treated with copper naphthenate before filling with flexible caulk.
645-2.07 Pole-Mounted Sign Support System. Bands, brackets, hardware, and fasteners necessary to
mount a sign panel or a sign panel assembly on traffic signal poles, street lighting poles or other poles shall be stainless steel. Bands shall be a minimum of 0.75 inch x 0.02 inch. Other methods of attachment may be substituted with prior written approval of the Engineer. A sign panel assembly is defined as a group of contiguous sign panels with a maximum separation of 6 inches.
645-2.08 Illuminated Signs. Illuminated Sign Panels shall be aluminum alloy 8 gauge thick meeting the
requirements of '730-01, Aluminum Sign Panels. All materials necessary to illuminate the sign panels shall be as shown in the contract documents.
645-2.09 Sign Covering Material. (Vacant.)
645-3 Construction Details
645-3.01 General. Sign panels, overhead panels, overhead vertical brackets, vertical and horizontal
Z-bars, sign support systems, sign posts, breakaway bases and hinge assemblies, and foundations for Type B sign posts shall be constructed in accordance with the contract documents, standard sheets, MUTCD and materials details. Sign locations shown in the contract documents are approximate, and the exact location for each sign will be approved by the Engineer in the field. The Contractor shall erect new signs and remove existing signs in such a manner that the traveling public is provided all necessary regulatory, warning, and guidance information at all times. Certain items may be designated to be performed prior to other items of work. An inspection of installed signs will be made in the daylight for color, reflectivity, location, vertical post alignment, visibility, and appearance. The installed signs will also be inspected at night for color, orientation and reflectivity, traits which will be more conspicuous at night.
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3 Signs, Luminaires, and Traffic Signals (1994). Allowable sign areas shall be reduced when the sign centroid height is at an elevated site condition (e.g., an overpass) where the influence of the ground on the wind is reduced. For example, a sign centroid between 29 feet and 49 feet above the existing ground would result in a 37.5% increase in wind pressure (refer to the section “Loads” in aforementioned AASHTO Specifications). TABLE 645-1 WIND LOAD CRITERIA Region Wind Velocity (mph) Wind Pressure at Panel Centroid 14.0 ft (psf) Wind Pressure at Panel Centroid > 14.0 ft (psf) Type A Post 1, 2, 6, 8, and 9 60 14.4 19.2 3, 4, 5, 7, 10, and 11 70 20.4 25.2 Type B Post 1, 2, 6, 8, and 9 70 NA 25.2 3, 4, 5, 7, 10, and 11 80 NA 33.6 NOTE: Panel centroid height measured above the surrounding terrain.
645-3.02 Sign Panels. Sign panels shall be installed as shown on the standard sheets or as shown in the
contract documents. Layout of sign panels and assemblies shall be as shown in the contract documents. Aluminum Overhead Mounted Sign Panels shall be separated from steel overhead sign structures in order to prevent corrosion by a Type A Sign Structure Bearing Pad or a Type B Sign Structure Bearing Pad as shown in the contract documents.
645-3.03 Type A and High-Capacity Type A Sign Posts. The Contractor shall install Type A sign posts
individually or in groups to provide the required total moment resistance.
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3
645-3.04 Type B Sign Posts. The Contractor shall install Type B sign posts, breakaway bases, hinge
assemblies and foundations in accordance with the details shown on the standard sheets or the manufacturer's approved materials details. The Type B sign post type, size and number shown in the contract documents are based on the information available during design. The sign post type, size and number to be installed by the Contractor shall be based on conditions at the final location approved by the Engineer. The Contractor shall determine the required moment resistance for the Type B sign post(s) based on the wind loads indicated in '645-3.01A. Wind Loads and verify the sign post type, size, number, hinge capacity and 7 feet wheel path criteria for the approval of the Engineer. The Contractor shall submit any computations to the Engineer. The Contractor may install breakaway type bases under the contract pay item for nonbreakaway type posts provided that nonslotted hinge plates are used on both flanges and the installation is outside the clear zone or otherwise protected.
645-3.05 Concrete Foundations. Concrete foundations shall be constructed in accordance with the
Materials Detail Sheets and contract documents. Upon completion of the sign installation the Contractor shall restore the area to its original state. TABLE 645-2 ALLOWABLE SIGN AREAS (SF) ON 2 BREAKAWAY WOODEN POSTS Wooden Post Section (inches) Embedment (ft) 60 mph Wind Velocity 70 mph Wind Velocity Height to Panel Centroid (ft) Height to Panel Centroid (ft) 6.0 8.0 10.0 12.0 6.0 8.0 10.0 12.0 3.5 x 3.5 5.0 14.6 11.0 8.7 7.3 10.3 7.7 6.1 5.2 3.5 x 5.5 6.0 35.1 26.3 21.1 17.5 24.7 18.6 14.8 12.4 5.5 x 7.5 7.0 93.1 69.7 55.8 46.5 65.6 49.3 39.4 32.8 NOTE: For 1 post, reduce allowable sign areas by 60%. For 3 posts, increase allowable sign areas by 50%. For 3 posts, separate outer posts by more than 8 feet.
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3
645-3.06 Breakaway Wooden Sign Posts. Breakaway wooden sign posts shall be installed in
accordance with Table 645-2, Allowable Sign Areas on 2 Breakaway Wooden Posts and Materials Details. Each sign stringer to post attachment shall be bolted completely through the post using two 3/8 inch diameter stainless steel bolts with nuts and washers. Posts shall use a concrete foundation as noted in Subsection 645-2.05 in this specification, with a steel tube insert or be backfilled with compacted cushion sand or stone screening, as noted in the Materials Detail Sheets and contract documents.
645-3.07 Pole-Mounted Sign Support System. Pole-Mounted Sign Support System, as defined in 645-
2.07, shall be firmly attached to the pole in accordance with the standard sheets and/or manufacturer's instructions.
645-3.08 Illuminated Signs. Illuminated sign panels shall be installed as shown in the contract
documents. All work on the illumination system shall be performed in accordance with the National Electrical Code and the requirements of the local utility. Electrical circuits shall be tested by the Contractor for insulation resistance and ground resistance in accordance with the requirements below. Testing equipment shall be supplied by the Contractor and the tests shall be performed in the presence of the Engineer.
645-3.09 Covering Signs. (Vacant.)
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3
645-4 Method of Measurement
645-4.01 General. (Vacant)
645-4.02 Sign Panels. The work will be measured as the number of square feet measured to the nearest
0.1 square feet of sign panel satisfactorily installed. The area of each panel will be measured as the area shown on the standard sheets. For sign panels not shown on the standard sheets, the area will be measured as the product of length and width, with no reduction for rounded corners. When sign panels are mounted back-to-back, each panel face will be measured separately.
645-4.03 Type A Sign Posts. The work will be measured as the number of Type A sign posts required,
which is the greater of either: The number of posts required based on the width of the sign; Or The number of posts of standard strength (2100 ft-lbs moment capacity) required to resist the moment due to wind load.
645-4.04 Type B Sign Posts and Rustic Type B Sign Posts. The work will be measured as the number
of Type B sign posts or rustic Type B sign posts satisfactorily installed. When the Engineer directs that a different size Type B sign post be installed at a location that is called for in the contract documents, and there is no contract pay item in the contract for the directed post, the original quantity shall be multiplied by the following factor: lb/ft of directed post divided by lb/ft of original post.
645-4.05 Concrete Foundations. The work will be measured as the number of concrete foundations for
Type A Sign Posts, or Breakaway Wooden Sign Posts with steel tube inserts satisfactorily installed.
645-4.06 Breakaway Wooden Sign Posts. The work will be measured as the number of breakaway
wooden sign posts satisfactorily installed.
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3
645-4.07 Pole-Mounted Sign Support System. The work will be measured as the number of pole-
mounted sign support systems satisfactorily installed.
645-4.08 Illuminated Sign Panels. The work will be measured as the number of square feet measured
to the nearest 0.1 square feet of illuminated sign panel satisfactorily installed.
645-4.09 Covering Sign Panels. (Vacant).
645-5 Basis of Payment
645-5.01 General. The unit price bid for all items shall include the cost of furnishing all labor,
materials, and equipment necessary to complete the work.
645-5.02 Sign Panels. The unit price bid for sign panels shall include the panels, sheeting, horizontal
and vertical stiffeners (Z-Bars), vertical overhead brackets to mount sign panels to overhead structures, and fasteners and miscellaneous hardware necessary to complete the work. The cost of sign panels that are to become part of larger signs (e.g., route shields on large guide signs) shall be included in the unit price bid for the main panel.
645-5.03 Type A Sign Posts. The unit price bid for Type A sign posts, Type A sign posts with extra
embedment, soil plates for Type A sign posts, and high-capacity Type A sign posts shall include the cost of furnishing all labor, materials and equipment necessary to complete the work.
645-5.04 Type B Sign Posts. The unit price bid for Type B sign posts shall include the posts, breakaway
base and hinge assemblies, and concrete footings. Breakaway bases provided in lieu of nonbreakaway posts at the Contractor's option will be paid for at the bid price for nonbreakaway bases.
645-5.05 Concrete Foundations. The unit price bid for Concrete Footing for Type A, or Breakaway
Wooden Sign Posts with steel tube inserts shall include the cost of furnishing all labor, materials and equipment necessary to install the footing and hardware.
645-5.06 Breakaway Wooden Sign Posts. The unit price bid for breakaway wooden sign posts shall
include the posts and backfill if required.
645-5.07 Pole-Mounted Sign Support System. The unit bid price for each pole-mounted sign support
system shall include the cost of furnishing all labor, materials and equipment necessary to install the sign panel or sign panel assembly on a pole, regardless of the number of bands used. New or relocated sign panels or sign panel assemblies and any required Z-bar stiffeners will be paid under their respective items.
645-5.08 Illuminated Sign Panels. The unit price bid for illuminated sign panels shall include the work
required under '645-5.02 Sign Panels, and all luminaires, bulbs, ballasts, wiring, conduit, and fittings from a point just above the footing to the most extreme luminaire. The unit price bid for illuminated sign panels shall also include the cost to energize and test the illuminated sign panel. The cost of energy necessary to illuminate sign panels before final contract acceptance shall be borne by the Contractor. The cost of controllers will be paid separately.
645-5.09 Covering Sign Panels. (Vacant.)
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3 Payment will be made under: Item No. Item Pay Unit 645.5101 Ground-Mounted Sign Panels without Z-bars Square Foot 645.5102 Ground-Mounted Sign Panels less than or equal to 32 SF with Z-bars Square Foot 645.5103 Ground-Mounted Sign Panels greater than 32 SF with Z-bars Square Foot 645.61 Overhead Sign Panels Square Foot 645.76 Illuminated Sign Panels Square Foot 645.81 Type A Sign Posts Each 645.8104 Type A Sign Posts with Extra Embedment Each 645.8105 Soil Plate for Type A Sign Post Each 645.8106 High-Capacity Type A Sign Posts with Soil Plates Only Each 645.8107 Concrete Footing for Type A, or Breakaway Wooden Sign Posts with Steel Tube Inserts Each 645.82 Breakaway Wooden Sign Posts Each 645.8XYYZZ Type B Sign Posts Each X Appearance YY Section ZZ Base 3 Galvanized 02 W6x9 01 Nonbreakaway 4 Rustic 03 W6x12 02 BidirectionalBreakaway 04 W8x15 03 Omnidirectional Breakaway 05 W10x19 06 W10x22 07 W12x26 08 W14x34 645.85 Pole-Mounted Sign Support System (Band Mounting) Each
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