Or at least about to. According to a DOT report, 56,000 bridges rate 4 or less on a scale of 1 to 9 - 9 being the best.
Chief Economist Dr. Alison Premo Black says the trucking industry alone loses about $80 billion each year due to the inefficiency of the aging and deteriorating transportation network.
I would guess this is due to having to detour to avoid the unsafe bridges.
More @ New Report on Bridges in America Highlights Infrastructure Needs | One America News Network