> Otherwise fight or flight would be kicking in every time you crossed the street.
That exact thing does happen to me. The drivers in my country are atrocious even if we do not consider the use of phones. Having to cross the street is quite stressful and do not dare to do so without running, even if I am in a another country with more sane drivers.
How does the joke go? You almost get hit by another car and you freak out and are amped up the rest of the trip. But doze off and drive on the shoulder, you just go back to sleep after a few minutes.