Section 2: Metal Railing
Anchor: #i1007193Traffic Railing Type T101
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This railing is 27 inches high with two rectangular tubes and W beam, and with W6X20 posts spaced a maximum of 8.33 ft. apart. Its minimum height after maintenance overlays is 27 inches. |
The T101 railing was approved for TL-3 use after evaluation of results from successful crash testing in 1978. See Figure 2-1, below.
Figure 2-1. Type T101 Railing
Anchor: #i1007213Traffic Railing Type T421
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This railing is 32 inches high and all steel. This railing has a 10.75-inch, round-pipe rail centered at 14 ¾ inches high and a 5.56-inch, round-pipe rail at 32 inches high. Its posts are slanted and are 5.56 inches in diameter, spaced a maximum of 7 ½ ft. apart. Its minimum height after maintenance overlays is not yet established. NOTE: This railing is no longer used for new construction. |
The T421 railing was crash tested in 1989 with a 4,500-lb. large car at 62 mph and at an angle of impact of 25 degrees. It was approved for TL-2 use (a design speed of 45 mph or less) after evaluation of the results from its 1989 crash testing. See Figure 2-2, below.
Figure 2-2. Type T421 Railing
Anchor: #i1007233Traffic Railing Type T6
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This railing is 27 inches high with two W-beam members welded back to back and with breakaway posts spaced a maximum of 6.25 ft. apart. Its minimum height after maintenance overlays is 27 inches. |
This railing is acceptable for TL-2 use (a design speed of 45 mph or less).
Anchor: #i1007242Pedestrian Railing Type PR1
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This railing is 42 inches high and all steel. It has six pipe rails, with 3-inch standard steel pipe for the top rail and 2-inch standard steel pipe for the lower rails. Its 5-inch wide steel-plate posts are spaced a maximum of 10 ft. apart. Its minimum height after maintenance overlays is 42 inches. |
The PR1 railing is designed for pedestrian loads only. It has not been crash tested, and it is not intended for exposure to traffic. If this railing is used on a bridge or culvert, it must be protected from vehicular impact by an approved bridge railing type. See Figure 2-3, below.
Figure 2-3. Type PR1 Railing