We had bridges along the MO River and still have a select few that were built in the 1920s, 8' lanes, NO edge on the lanes, semi's often busted each other's mirrors passing sides opposite directions. Are currently in that phase to bring them all down and replace. Even our old Interstate bridges were a hazard, built in the 1960s they had ten foot lanes, two way traffic then some Enganear comes up with redesign of Side Guard Rails in Concrete as a split Jersey Barrier and a Fifth lane as a second bridge is built to handle increased traffic flows for opposite direction, down to 9' travel lanes.