when on a long trip, your female companion provides sexual favors to help pass the miles, in particular a blow job.
three truckers did not notice my doing 75 mph while getting a road job from Sally
Oral sex given to the driver of a moving vehicle. Usually given by a female companion riding shotgun.
Kris: "Did you see how slow Gil was going through that intersection?"
Roland: "Yeah, he must of been getting one good road job."