London - A whiff of rose scent in cars can cut the number of accidents, researchers believe.
Scientists tested several different smells, including rose, lemon and civet, a musky smell used in perfumes.
In lab simulators, the fragrance was released when a car approached a hazard - such as an erratic cyclist.
Rose cut accidents by 64% while civet increased them by 46%. The Sussex University team believe smells in cars can alert the brain quicker than a visual warning.
But to work in real life, cars will need a trigger device to spot danger ahead.