Two studies from researchers in Great Britain show that driving while dehydrated and driving too long without a break on long trips can be dangerous.

The first study conducted by researchers at Loughborough University in England looked at the effects dehydration had on drivers. The researchers conducted a two-day experiment to compare driving abilities when drivers were hydrated and dehydrated. On the first day subjects who were properly hydrated were observed while driving on a simulated driving course. According to the researchers, the hydrated drivers had 47 driving incidents. On the second day, when the subjects were dehydrated, the number of incidents more than doubled to 101 incidents.

According to the researchers, the number of driving incidents recorded by those subjects that were dehydrated were equivalent to someone operating a vehicle with a blood alcohol content of 0.08, the legal limit in both the UK and the US. The incidents recorded included, lane weaving, braking late, and not stopping at the stop line at intersections.

According to WebMD.com. some of the symptoms of dehydration can include:

• Weakness
• Dizziness
• Palpitations (feeling that the heart is jumping or pounding)
• Confusion
• Sluggishness
• Fainting

All symptoms similar to alcohol intoxication.

Another poll conducted by IAM, a British highway safety organization, shows that drivers tend to drive too far between breaks on long trips. According to the drivers polled, 65 percent didn’t stop for breaks on long trips because they didn’t feel they needed to. Seventy- nine percent of the drivers polled said they wouldn’t stop unless there was a rest stop conveniently located on the highway.

The stresses of dealing with highway traffic along with what’s known as “highway hypnosis” can cause a driver to become fatigued and lose his or her focus on the whole driving picture. Without those refreshing breaks, fatigue can easily set in and, as shown by the research mentioned above, becoming dehydrated can lead to driver errors.

Whether they feel the need or not, drivers should stop at least every two hours or 100 miles to rest and refresh themselves. stopping for a short break to relax and have a drink can help a driver avoid fatigue and the problems caused by dehydration.

Drinking caffeinated drinks are fine if you want to fight off fatigue but caffeine has a diuretic effect that causes the body to lose fluids. To make the most of your rest breaks, alternate drinks between caffeinated drinks such as coffee or cola and non-caffeinated drinks such as water or fruit juice. Avoid highly caffeinated “energy drinks” at all costs.

Read more: Dehydrated drivers make the same number of mistakes as drink drivers

Two-thirds of drivers won’t take rest breaks on any long journey, IAM finds