Road markings_
and
_drivers as well as_
traffic.

answer:

you should learn to recognize these eight warning signs for drowsy driving:

you keep yawning.

you are unable to keep your eyes open.

you catch yourself “nodding off” and have trouble keeping your head up.

you can’t remember driving the last few miles.

you end up too close to cars in front of you.

you miss road signs or drive past your turn.

you drift into the other lane of traffic.

you drift onto the “rumble strip” or onto the shoulder of the road.

answer:

it's very crucial, and many factors of the crime scene can determine what happen during the crime.