Overhead Clearence

Just to tell you how that clearance sign came to be. Let's assume the road was repaved. Someone will make a WAG (wild a$$ guess) post a temporary sign, you hope, and call the road department. They will send out a survey crew who will actually measure what the clearances are and report it back to the office. Short as a couple of days to a week or longer. The office calls the sign shop (or sends them a work order) and the necessary signs are made (assuming materials available). Once they are made, the signs go back to the highway office where a work crew is scheduled to put the signs in the correct location re the bridge. Maybe another survey crew is sent out, or not to locate the true sign, and maybe the signs are finally put up for all to see. Time? A couple of weeks for the Superman of the road departments, to 2-3 months which would think is about average. BTW, I worked in the department that generally oversaw these actions in the city of Newark, NJ, a long time ago, but I doubt things like this change.