Wow this is clever. Anyone seen these? Quite an ingenious answer to low bridges. https://youtu.be/4EvTVWT9ZS4
More ‘clanker' balls installed on Delaware roads

YouTube

@gedeonm they need to be at least two semi truck lengths away.

With a turnaround.

A common problem with can opener bridges.: The trucker knows the bridge is 13.5, and his trailer height is 13. But the bridge is actually over a dip. 30 feet back from the bridge, the rear of that trailer is relatively over 14 feet relative to the over pass. The trailer wedges as the cab reaches the other side because the rear of the truck is higher. Roof of trailer is peeled off

@Chancerubbage yeah, the turnaround problem is real. If there’s no way to turn around and get out of the movement of traffic, then it’s almost as bad as hitting the bridge.

@gedeonm

There are warning signs further away, usually before a lane that would provide a turnaround

I am of the mind many with commercial drivers licenses can’t read. Or are at least too preoccupied.

Many have become dependent on audio turn by turn directions that do not account for any vehicle taller than a midsize sedan.