Not a firearms related suggestion, but I would look into taking an evasive driving course.
If you are in a car, then that is your best bet of getting out of a situation. By all means have a firearm up to the job, (I was going to suggest 10mm, 357SIG or the Tokarev: I was beaten to it), I feel that if you have to resort to a gun, then you're already on the back foot.
Using your car as a means of defense with a repertoire of evasive/offensive techniques would possibly give you results without needing to draw
You cannot wake someone who is pretending to sleep. Stop pretending. Wake up.
Doubt: ...it's the only thing I'm sure of...
-Marsupials: Nature's idea of Concealed-Carry-