33Navigation and Navigable Waters12008-07-012008-07-01falseSignalling for an opened drawbridge.117.21Section 117.21Navigation and Navigable WatersCOAST GUARD, DEPARTMENT OF HOMELAND SECURITYBRIDGESDRAWBRIDGE OPERATION REGULATIONSGeneral Requirementsยง 117.21Signalling for an opened drawbridge.
When a vessel approaches a drawbridge with the draw in the open position, the vessel shall give the opening signal. If no acknowledgment is received within 30 seconds, the vessel may proceed, with caution, through the open draw.