An underride guard–adequately designed, installed, and maintained–can mean the difference between life and death.
This JJ Keller Annual Vehicle Inspection Form does NOT list underride guards as an item for inspection. But, truck drivers, please make sure that your underride guard is in good condition!
This single unit truck is not currently required by DOT to have an underride guard. But look at what it does have at the back: a piece of metal that is highly unlikely to prevent a car from riding under it upon impact.