This is from the article redytrk pointed us to:
“The legal clearance shall be one foot less than the measured clearance,” reads the passage in New York’s Vehicle and Traffic law. “The measured clearance shall be the minimum height to the bridge or structure measured vertically from the traveled portion of the roadway. On bridges or structures having fourteen feet or more of measured clearance, no such signs shall be required.”
redytruk, people talk a lot about NY bridge clearance signs. This is the first time I have seen an official explaination about why the signs don't match the actual bridge clearances. Thank you for sharing this.
All hail Ron Pechtel! the retired truck driver who is raising the issue. New York's approach to bridge clearance signs is screwed up; idiotic, even. Just tell us what the true bridge clearance is like every other state in the union does.