Researchers at Cardiff University found that suffering from cold slowed down the reaction time of the drivers who tend to take longer when stopping a car and also drive too close to the vehicle in front of them, making them less aware of a possible collision.
Those who sneezed also took their eyes off the road for at least three seconds.
"Having a cold is equivalent to drinking three or four pints and being over the limit. People with a cold had slower reaction times than those associated with drinking. Colds slowed reaction times by 36 milliseconds. Yet consuming the amount of alcohol that would lead to a driving ban slows reactions by just 15 milliseconds", lead researcher Professor Andy Smith said.