Category talk:Better Roads, Brighter Future

Vertical Clearance and Depth Transitions

In this section it states, "Maintain a standard vertical clearance under bridges with standard vertical clearances." The link that this goes to is for bridge vertical clearances for new construction. Since the Better/Brighter projects are resurfacing I do not believe that this is the clearance that we want to use. It has always been my understanding that the minimum vertical clearance for new construction had built in extra clearance to provide for future resurfacing projects but I can't find where it states this number. On several bridges I have looked at it is possible to overlay the road and not require a height restriction sign but it reduces the clearance below the minimum vertical clearnce identified for new construction. Or is this section simply saying maintain the existing clearance in which case we need to coldmill under the bridge or replace the pavement.