By the time Bryan Lee headed to work along Highway 51 in Texas on Sept. 15, 2005, the road-building industry and its government overseers were painfully aware of a deadly, though easily corrected, construction hazard: pavement-edge drop-offs.
Accidents involving dangerous drop-offs kill about 160 people and injure 11,000 each year. Numerous studies have shown that the steeper the drop-off, the greater the danger.
In Texas in 2002, seven people were killed when a car slipped off a sharp edge of roadway and onto the shoulder, causing the driver to overcorrect into the path of a minivan. Four years before, six people died in a succession of accidents in another Texas work zone, where contractors had failed to smooth out the edge of a newly paved lane.
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