It depends how much one concentrates on the different activities. How much are the 20-and-under-year-olds concentrating on driving, with music so loud the bass rattles my apartment with all of the car windows closed? How aware are they of what's going on outside their car?

Seeing or being in a car accident can make one much more aware of how fragile our lives are and what the consequences of irresponsible driving are. In the town where I grew up, a woman died because someone drove up on the sidewalk because he was trying to swat an insect in his car. He got his license the day before.

I might have a little conversation with someone, but I'm sure not going to treat driving like a singing practice session, working out where to breath, and so on. That goes too far for me.