Now, blue light in your car to keep you alert at the wheel
not affected following the journeys with exposure to blue light.
They then analysed the number of times that a driver encroached on road markings (hard shoulder or centre line), reflecting a decrease in alertness.
The results of this test showed that on average, the line was accidentally crossed 15 times by the drivers exposed to blue light, 13 times by those who had had coffee and 26 times by those who had had the placebo.
Continuous exposure to blue light while driving therefore appears to be as efficient as coffee for fighting sleepiness at the wheel, as long as this light does not hinder the driver.
However, eight of the 48 volunteers (17 per cent) found that they were dazzled by the blue light and could not do the test.
The researchers are now verifying these first results by making a test on a larger number of subjects, including women and the elderly.
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