Ladies, PLEASE keep your windows closed, (or at most, just cracked open) and your car doors locked. If he can't enter the car, he can't put a strangle hold on you!
Also, as Grandma always told my mother & aunts, "never leave home without a large hat pin."
Cops and prosecutors have a very hard time proving you of violating a 'free victim zone', where guns and pepper spray, etc are banned.