People who ride bicycles are put in jeopardy when trying to ride across open metal grating bridges, sewer grates and storm drains. Metal grating bridges may have gaps between grating sections which can swallow bike tires. The grating itself can be slippery.
The above photo shows one particularly dangerous gap – large enough to engulf a road bike tire - in metal grating on State Road A-1-A in the Florida Keys. Storm drains can have linear gaps that are the perfect size to devour a narrow road bike tire.