At least put a cross beam like the one in the video, a lot less dangerous to cars when hit than the overpasses which will have crumbling concrete falling to the road.
I think a giant swing arm with a large hooked spike on the receiving end would be best. Hit the arm with your over height load and the spike swings around and catches/destroys your trailer before you can wreck the bridge.
At least put a cross beam like the one in the video, a lot less dangerous to cars when hit than the overpasses which will have crumbling concrete falling to the road.
I think a giant swing arm with a large hooked spike on the receiving end would be best. Hit the arm with your over height load and the spike swings around and catches/destroys your trailer before you can wreck the bridge.