They should rebuild all overpasses to 20', or like the old one years ago on US45 in Norris City, IL.
At 20' it is no question, just sail on.
The one in Norris City was about 9' in the middle to the oval arch, Sides were somewhat lower and made of those LARGE stone blocks with a rough texture.
You were very aware of its height, as you could see its top straight ahead of your windshield.
Never saw it hit, but lots of drivers leaned some quality backing skills there.