Without being able to say how common a particular set of traits is within a
population what statistical value can be
assigned to hair analysis?

Answerpersonal distress

The move over law is for safety of yourself and the officer and the ones pulled over, as a driver pulling over the officer control the situation with the pulled over person.

if it is an ambulance or fire truck with their sirens on it means they are having to get to an emergency so for the others safety for the emergency to save lives, pulling over lets them get through.

i hope this : )

1000 slices of bacon