a 'traveling companion' [=a person who goes with you when you travel somewhere]
The car was 'traveling' at a very high (rate of) speed.
That car was really 'traveling' when it passed us.
(..) - Don't look at him. Hey, guys. - You wanna take a walk? - Yeah. Hey, Travis, this here's Easy Andy. He's a traveling salesman. How you doing, Travis? - You got a. magnum? - It's an expensive weapon. That's all right. I got money. It's a real monster. (..)1976 Taxi Driver