SIGN SUPPORT DESCRIPTIVE CODES REQUIRED CLEARANCE …

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head per ASTM A307 with nut and helical-spring lock back-to-back, use a 5/16-18 UNC galvanized hex When two sign clamps are used to mount signs (When 6 ft min. is not possible.) possible Maximum slope. post could not be hit due to extreme guardrail or if Engineer determines the *** Post may be shorter if protected by lane as practical.

  Spring, Locks, Helical, Helical spring lock