I hear what you are saying. Different people react differently to different physical stresses. I used to be able to do this (what you are saying). 2.5 or 3.5 (can't remember) years ago I did take off on my own to do just that, visit my parents on my own. My car broke down 5 hours away from home on the interstate and required hours of repair. It was the coldest day of the year. I ended up dialing 911 to have the popo come get me before I turned into a popsicle. Everything turned out fine, but I'm gunshy about trying that again. I did call my wife when I broke down and she did drive the 5 hours to get me at that point in case my car couldn't be repaired or repaired in a timely manner.