7-120 SECTION 751 – DELINEATORS
751.01 Steel Delineators .
a.Steel Posts and Anchors . Steel posts, anchors, and sleeves shall be galvanized in accordance with the requirements of AASHTO M 111 after fabrication, and shall conform to the following additional requirements:
1.Steel posts fabricated as flanged channels shall conform to the mechanical requirements of ASTM A499, Grade 60 and the chemical requirements of ASTM A1, 85 lbs/yard to 114 lbs/yard Rail Class.
2.Steel posts and anchors fabricated as welded mechanical squ are tubes formed from hot - rolled carbon steel sheet shall conform to the mechanical and chemical requirements of ASTM A1011, Grade 380 (Grade 55) or Grade 245 (Grade 40). The posts may be fabricated in accordance with the requirements of ASTM A787, Type 2, and galvanized with a G140 Coating in accordance with ASTM A653. Alternatively, the posts may be fabricated in accordance with the requirements of ASTM A787, Type 3.
b.Sleeves . Sleeves for sign posts consisting of structural tubing shall conform to the requirements of ASTM A501 .
c.Assembly Hardware . Assembly hardware shall conform to the following requirements:
1.Bolts and Nuts . Bolts and nuts shall be fabricated from aluminum conforming to the requirements of ASTM B211 , Alloy 2024 -T4. Both bolts and nuts shall be given another coating at least 0.2 mil in thickness with dichromate or boiling water seal.
2.Washers . Washers shall be fabricated from aluminum conforming to the requirements of ASTM B209 , Alloy 2024 -T4.
751.02 FLEXIBLE DELINEATORS . Flexible delineators shall be surface mounted delineators in
accordance with the MUTCD for tubular markers for use on high -speed highways or nighttime use. Flexible delineators shall be MASH compliant with self -certification from the manufacturer and be one of the products listed on the Agency’s Approved Products List .
751.03 DETECTABLE WARNING SURFACE . Detectable warning surfaces shall be in accordance with
AASHTO M 333 . Detectable warning surfaces shall be cast iron, mechanically anchored, cast -in-place, and one of the products listed on the Agency’s Approved Products List . Detectable warning surfaces shall not be colored unless otherwise specified in the Contract. If coloring is specified it shall be applied by the manufacturer. 7-121 SECTION 752 – TRAFFIC SIGNALS
752.01 PEDESTAL POSTS AND BASES . Steel posts shall use cast iron bases and aluminum posts shall
use cast aluminum bases .
a.Pedestal Posts . Pedestal posts shall have no taper and shall be threaded at the lower end to fit the base.
1.Steel Posts . Steel posts shall consist of 4 -1/2 inch outside diameter galvanized steel pipe conforming to the dimensional requirements of ASTM A501 or ASTM A53 , Type S, Grade B standard weight. Galvanizing sha ll be in accordance with AASHTO M 111 .
2.Aluminum Posts . Aluminum posts shall consist of 4 -1/2 inch outside diameter aluminum structural pipe conforming to the requirements of ASTM B429 , Alloy 6063 -T6.
b.Bases .
1.Cast Iron Bases . Cast iron bases sh all conform to the requirements of AASHTO M 105 , Class 20 or higher. Galvanized cast iron bases shall conform to the requirements of ASTM A126 , Class A. Galvanizing shall be in accordance with AASHTO M 111 .
2.Cast Aluminum Bases . Cast aluminum bases sha ll conform to the requirements of ASTM B26 or ASTM B108 , Alloy SG70A -T6.
752.02 Traffic Signal Assembly .
a.Steel Poles and Baseplates . Steel poles shall consist of tapered tubular shafts. Tapered t ubular shafts for cantilevered overhead signal structures shall meet the applicable requirements of ASTM A595 , Grade A; ASTM A1011 , Grade 50; or ASTM A572 . Tapered t ubular shafts for non - cantilevered overhead signal structures shall meet the applicable requirements of ASTM A500 , Grade B or API 5L , Grade X42. Steel properties shall conform to the requirements of the AASHTO Standard Specifications for Structural Suppor ts for Highway Signs, Luminaires, and Traffic Signals . After fabrication , the shafts shall have a minimum yield strength of 48 ksi. The metal thickness shall be not less than 0.25 inches. The steel poles shall be capable of withstanding the stringing tensi on of the span wire with its signal load without exceeding a deflection of 6 inches and a bending stress limit of 66% of the yield strength.
Source: Vermont Standard Specifications for Construction, 2024 Edition. Pages 1272–1272 of 1,380.