my doors autolock once you start driving, but i've been driving my mom's car this week and they don't. it got me thinking- are you supposed to lock your doors while driving? is it to prevent people from car jacking the car at a stop or to keep them from flying open in an accident? doesn't locking them make it harder for them to get you out of the car in case of an accident?

do you drive with your doors locked or unlocked? do you have a reason?