Nissan has unveiled a high-tech sweat detector which warns motorists when they need to drink water, after studies showed dehydration can be as bad as drink-driving.
Researchers found motorists who consume only a sip of water (25ml) per hour made more than double the number of mistakes on the road than those who were properly hydrated.
Researchers apply the coating to the steering wheel and front seats, which then changes colour when it is in contact with perspiration.
When dehydrated the SOAK coating turns yellow and when rehydrated it turns blue.
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