When any vessel shall signal for any bridge across the Chicago River or any of its branches, the bridge tender shall immediately open the bridge.
If, from any cause, the bridge tender cannot open the bridge, he shall immediately notify the vessel by waving a red flag by day and a red lantern by night and continue waving the same until the vessel has stopped, continuing thereafter to display the same until the bridge can be opened. As soon as the cause for stopping the vessel has been removed, the bridge shall be immediately opened.
It shall be unlawful for the owner, officer, or other person in charge of any vessel in transit upon the Chicago River and its branches to attempt to navigate any such vessel past any of the bridges over said river or branches, while a stop signal is being given or displayed.
(Prior code § 38-46)