>>5485007 (lb)
the best way to do road repairs is with a dedicated trust fund tied to that part of the highway. In the case of a bridge one would hope that on-going maintenance and continued vigilance as to faults and problems would result in little or no traffic hangups because of bridge repairs.
the real way if the bridge is close to being unsafe is to build a new bridge along side the old, and close the old after the new is constructed.