It was really interesting when they detoured I-84 down Route 6 through beautiful downtown Port Jervis due to a fatal accident on the Delaware River bridge. A lot of truckers were soiling their pants.
You need to get withing 300 feet of the bridge to see the magic sign that proclaims "Actual clearance 13' 6" "...
If I recall, they dug down through near two feet of pathetic pavement jobs to repave.
And the signage does suck as you mention.