The pairing may happen on individual basis, basically when most of work is teamwork and they don't need you to go around alone anyway. A lot of work is single person work. Or when boss is nice and willing to help you out and organize more.
So I guess that depends on what exactly the company needs you to do. Plenty require car so that you are flexible whether there is acute need for it or not.
And don't forget prejudice against people without cars, it is out of norm and suspect for many people. (Same with being homeless, they may not give you job for fear of you being trouble).