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Through urban areas, at least one routing is to have 16-foot (4.9 m) clearances, but others may have a lesser clearance of 14 feet (4.3 m). Sign supports and pedestrian overpasses must be at least 17 feet (5.2 m) above the road, except on urban routes with lesser clearance, where they should be at least 1 foot (30 cm) higher than other objects.
These may involve over-height vehicles, or low vertical clearance bridges or tunnels. These accidents occur frequently and are a major issue worldwide. In United Kingdom, railway bridge strikes happen on an average of once every four and half hours with total of 1789 times in 2019. Several bridges being hit over 20 times in a single year.
The clearance below required under bridges for the largest ships—container ships, ocean liners and cruise ships—is around 220 feet (67 m) so there are often bridges with approximately that height located in coastal cities with bays or inlets, such as New York City's Verrazzano-Narrows Bridge and San Francisco's Golden Gate Bridge.
The one-lane bridge carries Robert Parker Coffin Road over Buffalo Creek in Long Grove, a village located 30 miles (48 km) northwest of Chicago, Illinois. [2]: 4 It connects the Long Grove Community Church to the southwest with downtown Long Grove, formed at the road's intersection with Old McHenry Road, to the northeast.
The code also defines the clearance that is shorter than the physical clearance to account for sag curves, bridge deflection and expected settlements with a recommendation of minimum clearance of 5 metres (16 ft 5 in). [2] In UK, the "standard minimum clearance" for structures over public highways is 16 feet 6 inches (5.03 m). [3]
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The 1877 bridge and its counterparts, while the most common bridge of the mid-19th century, were criticized by both the shipping and real estate industries of Chicago. As the 19th century came to a close, shipping vessels had grown larger, and the swing bridges' center piers had become navigational hazards.
The Cortland Street Drawbridge (originally known as the Clybourn Place drawbridge) [4] over the Chicago River is the original Chicago-style fixed-trunnion bascule bridge, designed by John Ericson and Edward Wilmann. [3] When it opened in 1902, on Chicago's north side, it was the first such bridge built in the United States.