A 2007 survey found that 60 per cent of Canadian drivers admit they occasionally drive while fatigued, but the dangers of drowsy driving remain underreported.
Drunk driving and distracted driving are well known dangers on the road but many may not realize how dangerous it can be to drive while tired.
Driving columnist David Booth says a recent study by AAA in the U.S. is shedding light on how underreported the issue is.
"They were saying it accounts for just over 10 per cent of all serious, reportable accidents, whereas in previous we thought it accounts for one per cent of accidents and wasn't really that important to address," said Booth.
Booth says the problem in part is because researchers often rely on police reports, but drowsy driving can be difficult to determine.
Meanwhile Transport Canada estimates sleepy drivers are involved in as many as 20 per cent of collisions. That's calculated by eliminating other possible causes.
Drivers who do feel fatigued behind the wheel are encouraged to pull over and take a 20-40 minute nap to reduce sleepiness.