Munich - Falling asleep behind the wheel for even a split second is one of the most common causes of serious accidents, according to Germany's motoring association ADAC, warning motorists to take precautions when they feel the first signs of tiredness.

Accident researchers have found that lack of sleep poses the same risk on the road as driving under the influence of alcohol. A car driving at a speed of 100 km/h could be out of control for a distance of 28 metres if the driver falls asleep for one second.

Some car manufacturers are offering so-called "alert" assistance systems that detect the first signs of weariness with an onboard camera monitoring the eyelids of the motorist. A buzzer or a vibration of the steering wheel then tells the driver that it is time to stop. But in the end it is always the driver who is responsible, so here are some safety tips:

Be aware of your own biorhythm. Some people can for instance be more tired in the afternoon than during the first part of the evening.

Never drive more than two hours without taking a break.

You should not be on the road for more than ten hours a day.

If you feel tired, head for the nearest parking spot and take a nap, even if it is only for 15 or 20 minutes. You will feel more refreshed than forcing yourself to continue driving and you should always be aware that saving time behind the wheel is not worth the risk to yourself and others on the road. (dpa)