Accepting that random dangers outside of our control exist is actually entirely different than the hypervigilance. Your bus example: Do you go into a panic at the sight of a bus? Do you check that every bus you see comes to a complete stop & doesn't have faulty brakes? Do you wait for buses to leave the area before you proceed?

With hypervigilance you are identifying threats that do not likely exist given the current context of the situation. Classic post-war examples are where someone needs to check their corners before exiting an aisle of a grocery store or fears slowing down at an intersection because it leaves them vulnerable, even though they are in their hometown. It can interfere greatly with someone's quality of life.