The trouble with mobile phones is not being able to get any signal in certain areas. Here in rural Norfolk, UK, my mobile phone is totally useless, no signal whatever. Another hazard in, say, Lincolnshire, is the very real possibility of skidding into a drainage dyke or ditch, which line many of the rural roads. If your vehicle breaks the ice, you quickly drown or succumb to hypothermia. I'm sorry for all the folk who want to see their relatives at Christmas, but honestly, NOT to travel is really the best solution.