Pipeline and Haz. Matls. Safety Admin., DOT

1 = Radius of Circle - 
Minimum dimensions
4 mm (0.16 inch) for markings and labels
12.5 mm (0.5 inch) for placards
2 = 11-2 Radii

Pt. 172, App. B

3 = 5 radii for markings and labels
41-2 radii for placards.
[60 FR 50306, Sept. 28, 1995, as amended by
Amdt. 172-143, 61 FR 20750, May 8, 1996]

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