alcohol

asleep

attention

automobile

bored

car

closed

confusion

danger

dangerous

dizzy

drive

driver

driving

drowsiness

drowsy

drunk

exhausted

exhaustion

eyes

fatigue

human

insufficient

lack

man

napping

overworked

person

risk

road

safety

sleep

sleeping

sleepy

stop

stress

tired

tiredness

transportation

unhappy

unsafe

vehicle

weariness

weary

wheel

while

working

yawn

yawning