Have you ever focused on stopping the hypervigilance? I mean by finding yourself anticipating and then focusing on that with self talk and self soothing?

You can't just switch it off. You stop the automatic responses with focused work on what is being triggered.

For you to recognize what was triggered by those police cars is pretty good. How did you handle the trigger? How did it go?

So each paragragh here addresses 3 different things going on -
1) hypervigilance and anticipatory anxiety
2) working on the stuff that is being triggered
3) surviving the triggers in the present