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| Blue LEDs to reset tired truckers' body clocks |
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Eerie blue LEDs in truck cabs and truck stops could be the key to reducing accidents caused by drowsy drivers, say US researchers. They say bathing night drivers in the right light can increase their alertness by resetting their body clocks.
The scientists at Rensselaer Polytechnic Institute, New York, are testing blue LEDs that shine light at particular wavelengths that convince the brain it is morning, they say, resetting the body’s natural clock.
That could help reduce the number of accidents that occur when people drive through the night. Nearly 30% of all fatal accidents involving large trucks in the US happen during the hours of darkness, according to a recent report by the Federal Motor Carrier Safety Administration, while fatigue causes half of all truck accidents in the early hours on UK motorways.
Wakey wakey
"The concept of using light to boost alertness is well established [in other areas]," says Mariana Figueiro, co-author of a new white paper published by the institute’s lighting research centre.
"Translating that understanding into a practical application is the next challenge." Drivers could take 30-minute "light showers" in truck stops fitted with similar lights, or the lights could be fitted into truck cabs.
Figueiro is currently investigating how the blue light affects daytime alertness of sleep-deprived and non-sleep-deprived subjects. "These findings will also be applicable to transportation applications, since the accident rates during the afternoon hours are still higher than in the morning hours," says Figueiro.
Results so far show a clear effect on the brain activity of test subjects of both kinds, she adds. "After 45 minutes there is a clear effect," says Figueiro. "You start to see a beautiful increase in brain activity in the 300 milliseconds response, which is a measure of alertness." The current test box emits diffuse light at 470 nanometres, with an intensity of 40 lux when measured at the eye.
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| Read:0 Date:2008-8-7 |
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