33 CFR § 401.38
Limit of approach to a lock
August 2, 2023
§ 401.38 Limit of approach to a lock.
A vessel approaching a lock shall comply with directions indicated by the signal light system associated with the lock and in no case shall its stem pass the designated limit of approach sign while a red light or no light is displayed.
[74 FR 18995, Apr. 27, 2009]