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The single lane along the span is 13.41 feet (4.09 m) wide and has a vertical clearance of 15.75 feet (4.80 m). However, in order to restrict traffic before the closure of the bridge, there were 8.5-foot (2.6 m) clearance bars placed on each side of the bridge. These helped prevent overweight vehicles from crossing the structure. [1]
In May 1990, NYSDOT engineers confirmed that the bridge would be opened again in June 1990 with the repairs finished and the new clearance bars installed. The bridge would then be set to the planned 16-ton weight capacity. A second contract would also result in inspection of the bridge upon completion. [21] The bridge re-opened in July 1990. [22]
During their January 2022 monthly meeting, the Blount County Commission began to look into placing clearance bars at each end of the Swann and Easley covered bridges along with putting speed bumps at the approaches, recommended by the county engineer, in order to improve motor vehicle safety.
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.
In civil engineering, clearance refers to the difference between the loading gauge and the structure gauge in the case of railroad cars or trams, or the difference between the size of any vehicle and the width/height of doors, the width/height of an overpass or the diameter of a tunnel as well as the air draft under a bridge, the width of a lock or diameter of a tunnel in the case of watercraft.
These regulations state that the clearance in the back of grab bars must be at least 4 inches, the diameter similar to the ladder rungs and, when horizontal, grab bars must be spaced by a continuation of the rung spacing. In 2008-2009 alone, the USDOL Bureau of Labor Statistics reported 241 casualties from ladder falls. [5]
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A tell-tale warning of a low clearance over a road. A tell-tale, also known as a bridge warning, is a series of ropes suspended over railway tracks to give warning to the engineer, and more importantly the brakeman who may be scampering across the tops of the cars, that the train is approaching a low-clearance obstacle, such as a tunnel or a bridge.
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