730 TRAFFIC SIGN AND SUPPORT MATERIAL

730.01 Steel Tube and Pipe. Furnish steel tube and pipe conforming to ASTM A 53, Grade B or ASTM A 501, except provide tubing for truss and end frame diagonals conforming to 711.01.

730.015 U-Channel Posts. Furnish U-channel posts fabricated from steel into a characteristic cross-section that may be used alone or paired to form a heavier post by being bolted together back to back. Cut posts square to a length tolerance ±1 inch (±25 mm) and ensure that posts do not have ragged or sharp edges, or cracks or other imperfections affecting strength or durability. The back of the posts may be flat or contain raised longitudinal ribs.

Furnish posts conforming to Supplement 1075. Furnish posts manufactured from rail or billet steel conforming to ASTM A 499, Grade 60, except that the chemical composition by percentage is as follows:

Carbon	0.67 to 0.82
Manganese	0.70 to 1.00
Phosphorous, maximum	0.05
Silicon	0.10 to 0.25

Furnish posts that do not exceed a maximum value of 1100 inch-pounds per square inch (193 kN×m/m²) as determined by a Charpy test conducted on a specimen of post at 150 °F (66 °C) according to ASTM E 23.

Post Size Number	Weight lb/ft (kg/m)	Tolerances %
1	1.12 (1.7)	-3.5, +10.0
2	2.00 (3)	-3.5, +10.0
3	3.00 (4.5)	-3.5, +10.0

Furnish posts with 3/8-inch (10 mm) diameter holes accurately punched on the centerline spaced at 1-inch (25 mm) centers beginning not more than 1 1/8 inches (30 mm) from the top of the post through the entire length, to allow bolting the posts back to back, without redrilling, using 5/16-inch (8 mm) diameter bolts. Furnish posts that have been galvanized after punching according to 711.02.

730.016 Square Posts. Furnish square posts fabricated from steel conforming to ASTM A 1011 with a minimum yield strength of 60,000 pounds per square inch (415 MPa), with 7/16-inch (11 mm) diameter die-cut knockouts or open holes spaced on 1-inch (25 mm) on the centerline of all four sides, in true alignment and opposite each other. Furnish posts that have been finished with one of the following methods:

A. Both inside and outside of the post are hot-dip galvanized according to ASTM A 525 (A 525M), G-90.

B. The outside of the post has a zinc coating of 0.80 ounce per square foot (244 g/m²) followed by chromate conversion coating and a cross-linked polyurethane acrylic coating. The inside of the post has a zinc organic coating.

730.02 Steel Anchor Bolts and Nuts. Furnish anchor bolts made of steel with a minimum yield strength of 85,000 pounds per square inch (586 MPa), galvanized according to 711.02 at least 2 inches (50 mm) beyond the threads, with the end either bent or with a drilled and tapped steel plate. Furnish leveling nuts and anchor nuts capable of developing the full strength of the anchor bolt.

730.03 Steel Poles and Arms. Furnish poles and arms made of steel with a minimum yield strength of 52,000 pounds per square inch (359 MPa) and galvanized according to 711.02.

730.04 Base and Arm Plates. Furnish support or pole anchor bases and arm attachment plates fabricated from steel plate conforming to ASTM A 36 (A 36M) or ASTM A 572 (A 572M), Grade 42. Weld plates to supports, poles, or arms both inside and outside with fillet welds equal to the wall thickness, or by AWS prequalified welding joints TC U4a-S or TC U4c-GF. The Contractor may use a cast steel base of equivalent strength.

730.05 Handhole Covers. Furnish handhole covers for poles and overhead sign supports made of 0.109-inch (2.7 mm) galvanized steel or 0.125-inch (3 mm) nominal aluminum alloy.

730.06 Pole Caps. Furnish pole caps made of aluminum, galvanized ferrous metal, or zinc die casting.

730.07 Arm Caps. Furnish arm caps made of steel that cover at least 50 percent of the end area.

730.08 Steel Hardware. Furnish bolts 5/8-inch (16 mm) diameter or larger conforming to ASTM A 325 (A 325M). Furnish bolts and screws less than 5/8-inch (16 mm) diameter conforming to SAE J429, Grade 5. Furnish nuts of all size, except anchor nuts and leveling nuts conforming to SAE J995, Grade 2. Furnish flat washers conforming to ANSI B18.22.1. Furnish lock washers conforming to ASME B18.21.1. Furnish U-bolts conforming to ASTM A 307. Furnish all hardware that is hot-dipped galvanized according to ASTM A 153 or mechanically galvanized according to ASTM B 695, Class 50.

730.10 Stainless Steel Hardware. Furnish stainless steel hardware conforming to ASTM A 320/A 320M (AISI 300 series). Furnish bolts, screws, nuts, washers, handhole cover chains, and U-bolts that are passivated commercial grade.

730.11 Aluminum Sheet and Plate. Furnish sheets for extrusheet panels conforming to ASTM B 209 (B 209M), 3003-H18, or 5052-H38. Furnish sheets for flat sheet and overlay signs, conforming to ASTM B 209 (B 209M), 3004-H38, 5052-H38, or 6061-T6. Furnish plates for sign support structures conforming to ASTM B 209 (B 209M), 6061-T6.

730.12 Aluminum Extrusions. Furnish extruded panels and extrusions for extrusheet panels conforming to ASTM B 221 (B 221M), 6063-T6. For sign support structures, provide rolled or cold finished bar, rod, and wire conforming to ASTM B 211 (B 211M), 6061-T6; provide extruded bars, rods, shapes, and tubes conforming to ASTM B 221 (B 221M), 6061-T6.

730.13 Aluminum Tube and Pipe. Furnish seamless pipe and seamless extruded tube conforming to ASTM B 241/B 241M, 6061-T6. Furnish extruded structural pipe and tube conforming to ASTM B 429, 6061-T6.

730.14 Aluminum Castings. Furnish sand castings conforming to ASTM B 26/B 26M, 356-T6 or T7. Furnish permanent mold castings conforming to ASTM B 108, 356-T6 or T7.

	ASTM Designation	Alloy	Condition/ Temper
Bolts and screws	B 211 (B 211M)	2024 6061	T4 T6
Studs-welded	B 211 (B 211M)	1100	H16
Nuts-hex	B 211 (B 211M)	6061 6262	T6 T9
Nuts-lock	B 211 (B 211M)	2017	T4
Washers-flat	B 209 (B 209M)	Clad 2024 6061	T4 T6
Lock washers	B 211 (B 211M)	7075	T6
Rivets-solid	B 316/B 316M	6053 6061	T6 T6
Rivets-blind	B 316/B 316M	2017 2117 5052	F F F

In addition, provide break-mandrel aluminum blind rivets with a stainless steel or aluminum mandrel.

730.18 Reflective Sheeting Type F. Furnish Type F reflective sheeting conforming to Supplement 1049, and contained on the List of Prequalified Reflective Sign Sheeting Materials. Furnish sheeting conforming to ASTM D 4956, Type I, including supplemental requirement S1.

730.19 Reflective Sheeting Type G. Furnish Type G reflective sheeting conforming to Supplement 1049, and contained on the list of prequalified reflective sign sheeting materials. Furnish sheeting conforming to ASTM D 4956, Type III or IV, including supplemental requirement S1.

730.191 Reflective Sheeting Type G, Reboundable. Furnish Type G reboundable reflective sheeting conforming to Supplement 1049, and contained on the list of prequalified reflective sign sheeting materials. Furnish sheeting conforming to ASTM D 4956, Type III or IV, including supplemental requirements S1 and S2, with watermarks or other identification marks inconspicuously incorporated into the face of the sheeting on a repeating pattern if necessary to distinguish the sheeting from other similarly appearing sheetings.

730.192 Reflective Sheeting Type H. Furnish Type H reflective sheeting conforming to Supplement 1049, and contained on the List of Prequalified Reflective Sign Sheeting Materials. Furnish sheeting conforming to ASTM D 4956, Type VII or VIII, including supplemental requirement S1. Furnish fluorescent orange reflective sheeting conforming to ASTM D 4956, Type VII or VIII, including supplemental requirement S1, and the following requirements:

A. The color specification limits for fluorescent orange are as shown for orange in ASTM D 4956, Table 13. The minimum luminance factor (Y%) is 30.

Observation Angle (degree)	Entrance Angle (degree)	Minimum Coefficient of Retroreflection cd/fc/ft² (cd×lx^-1×m^-2)
0.2	-4	200
0.2	+30	120
0.5	-4	80
0.5	+30	50

Furnish fluorescent yellow green reflective sheeting conforming to ASTM D 4956, Type VII or VIII, including supplemental requirement S1, and the following requirements:

A. The color specification limits for fluorescent yellow green sheeting are as follows:

1		2		3		4
x	y	x	y	x	y	x	y
0.387	0.610	0.460	0.540	0.421	0.486	0.368	0.539

The four pairs of chromaticity coordinates determine the acceptable color in terms of the CIE 1931 Standard Colorimetric System measured with Standard Illuminant C. The minimum luminance factor (Y%) is 50. The minimum fluorescence luminance factor (Y_F%) is 20.

B. The photometric requirements for fluorescent yellow green sheeting are as follows:

Observation Angle (degree)	Entrance Angle (degree)	Minimum Coefficient of Retroreflection cd/fc/ft² (cd×lx^-1×m^-2)
0.2	-4	480
0.2	+30	240
0.5	-4	220
0.5	+30	105

730.193 Reflective Sheeting Type J. Furnish Type J reflective sheeting conforming to Supplement 1049, and contained on the list of prequalified reflective sign sheeting materials. Furnish sheeting conforming to ASTM D 4956, Type IX, including supplemental requirements S1. Furnish fluorescent yellow green reflective sheeting conforming to ASTM D 4956, Type IX, including supplemental requirement S1, and the following requirements:

A. The color specification limits, minimum luminance factor, and minimum fluorescence luminance factor for fluorescent yellow green are as shown in 730.192.

B. The Photometric requirements for fluorescent yellow green sheeting are as follows:

Observation Angle (degree)	Entrance Angle (degree)	Minimum Coefficient of Retroreflection cd/fc/ft² (cd×lx^-1×m^-2)
0.2	-4	325
0.2	+30	205
0.5	-4	240
0.5	+30	110
1.0	-4	65
1.0	+30	35

730.20 Nonreflective Sheeting. Furnish non-reflective sheeting conforming to ASTM D 4956, except provide sheeting that does not incorporate any optical elements.

730.22 Silk Screen Inks. Furnish opaque and transparent process color inks used in the silk screen process that are approved for use by the manufacturer of the reflective sheeting to which they are applied, and conforming to Supplement 1049. Use inks that provide a tough, durable film of uniform thickness and appearance on the sign surface. Furnish transparent process color inks used in the reverse screen process conforming to the color specification limits in ASTM D 4956, Table 13.

730.23 Transparent Electronic Cuttable Films. Furnish transparent electronic cuttable films that are approved for use by the manufacturer of the reflective sheeting to which they are applied, and conforming to Supplement 1049. Use films that provide a uniform appearance on the sign surface. Furnish films conforming to the color specification limits in ASTM D 4956, Table 13.

730.25 Plywood. Furnish exterior Type B-B, Group 1, 60/60 high density overlay plywood panels conforming to National Bureau of Standard specification PS-1.