Example of the painted "Blue Line" which tells the lock workers you wish to lock through. There were no VHF radios 186 years ago, so lock workers don't have any. However, you can always call a lock on their cell phone, just like 186 years ago. Don't tie up on the Blue Line even for a 5 minute bathroom break.

Example of the painted "Blue Line" which tells the lock workers you wish to lock through. There were no VHF radios 186 years ago, so lock workers don't have any. However, you can always call a lock on their cell phone, just like 186 years ago. Don't tie up on the Blue Line even for a 5 minute bathroom break.