(The study showed that drivers who drank only 25 ml of water an hour made more than twice the number of mistakes as drivers who had drunk enough water.
Professor Maughan, who published the findings, said, “We all deplore drink driving, but we don't usually think about the effects of other things that affect our driving skills, and one of those is not drinking and dehydration. There is no question that driving while incapable through drink or drugs increases the risk of accidents, but our findings highlight an unrecognised danger and suggest that drivers should be encouraged to make sure they are properly hydrated.”
I can see it now:-
Policeman: "Sir, you are 3 times over the legal limit."
Driver: "At least I'm not dehydrated, officer.")