You could easily pick up a few martial art moves that will help you defend yourself against anyone, anywhere.

I highly recommend training to use a cane, walking stick, or a traditional full length umbrella. 

In the past if someone wanted to steal your car for a joy ride or use to commit a crime, they did so at night while you slept…

Being unarmed against a knife is a deadly situation that no one wants to face.
Unfortunately, I was unlucky enough to encounter a knife-wielding assailant on one cool fall day.