Gaussians don't work very well when the typical value is near one of the bounds. For example say 3/4 of drivers don't eat, apply makeup, talk on the phone, etc,

Gaussians don't work very well when the typical value is near one of the bounds. For example say 3/4 of drivers don't eat, apply makeup, talk on the phone, etc, while driving, and generally pay attention to the road; that sort of attentiveness is probably most of what makes a good driver, so you'd have the majority of people being near one extreme of the possible range and get a rather one-sided distribution.