I ride alone all the time. I tell the wife where I'm going and carry a cell phone which gets usable service most of the time. I'm not worried about it.

I used to get a little nervous riding after dark, but I've gotten over that. The most dangerous IMO is when I ride solo, after dark, during the winter. It's marvelous being out in the silent white darkness all alone but if I were to crash and become immobilized then hypothermia could set in really quick.