Having a bad cold or the flu can significantly affect a driver’s responses, insurers have claimed.
One hundred drivers with a range of conditions including colds, stress and headaches and 50 who were healthy were put through a hazard simulator test.
The research, for Lloyds TSB Insurance, found that drivers with colds scored, on average, 11% worse - equivalent to the effect of a double whisky.
Experts said being ill could affect driving ability.
The study, carried out by PCP research agency, looked at 60 people with colds and flu as well as 40 with other conditions including premenstrual syndrome.
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