Another Car Question

[eightyeightfan1]

... cars that automatically lock the doors when you put the car in gear.

My Caravan, both front doors can be opened without hitting the button, both sliders, and the hatch I have to hit the button. Another safety device I like with the Caravan is, I can't unlock the doors while in drive, even if stopped. My Grand Am, I have to hit the button for all the doors.