Here is my submission:

Just so this isn’t impossible, I’ll give you a few hints:
1. If you have driven on I-85 in NC, you have probably been close to it. I myself have been on that road, but didn’t stop to see it.
2. You may have seen this bridge before, but maybe not in person. I know I have!
3. My final hint: it is notorious for being able to constantly do something, even after several modifications ...