Why did Dr. Shirley in Green Book even need a driver?

I'm 40 minutes into the movie and just realized, why would he need a driver? If they are a trio and a car fits 3 people easily. I get that he might have also wanted Tony for security, but still. If that was the case, why couldn't he just drive the car WITH all 3 of them in that same car? Now they have to... show more I'm 40 minutes into the movie and just realized, why would he need a driver? If they are a trio and a car fits 3 people easily. I get that he might have also wanted Tony for security, but still. If that was the case, why couldn't he just drive the car WITH all 3 of them in that same car? Now they have to spend a lot more money on gas, and on top of that it would probably be more "fun" for Dr Shirley as well as the other 2, since they would be spending time together. Now Dr Shirley is just all by himself with a driver he can't stand for 8 weeks. Maybe it gets explained later into the movie, but it just didn't make sense to me.
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