Race Car Driver Chris Rado Arrested for DUI

Race car driver Chris Rado has a driving related problem that has nothing to do with a pro race -- he's been busted for suspicion of DUI.

According to our sources, Rado was pulled over for an unknown traffic violation early Friday morning. We're told officers detected an odor of alcohol, so they administered a field sobriety test ... the results of which were enough to book him on misdemeanor suspicion of DUI.

Rado was held on $5,000 bail, which he posted Friday afternoon.