That's funny, I was talking with my mother earlier today about people stressing out when they're driving, and I was saying how humans are definitely <i>not</i> evolved for driving. Instead we design our cars to take advantage of the biology and instincts that we do have, with the practical upshot that a lot of drivers at any given moment are high on adrenaline and cortisone, without which we probably wouldn't even be able to process rush hour traffic.