But many drivers also described working conditions that could undermine safety efforts and foster driver fatigue.

Playing loud music is also useless in fighting driver fatigue.

You're on the road and it hits you - not driver fatigue or the need for a bathroom break.

Nine other passengers were injured in the crash, which officials said might have been caused by driver fatigue.

This failure was probably caused by a missed gear change due to driver fatigue.

Reaction times also were cut by more than a tenth of a second, and driver fatigue was lowered.

They say driver fatigue or error is more likely to blame.

Since it opened 2 years ago, 7 deaths have been attributed to driver fatigue.

As an inquiry into the cause begins, one prime theory will be driver fatigue.

It's not certain that driver fatigue did contribute to this latest accident.