Originally Posted by InfernoRedXfire
Actually, I'm not 100% sure the rule would not apply here in TX. If I'm in a big mall parking lot with stop signs and somebody ran one and hit me, I would want them at fault.
I know for a fact that if you are driving on private property (even your own driveway) without a seat belt you can be ticketed. I learned that in a defensive driving class. 
Civilly they should be responsible, but I don't think they should get a traffic citation for it as it was on private property.