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Originally Posted by Michael1
Does anyone read anything here? GM's study showed DRLs improving the accident rate at NIGHT! How does a DAYTIME Running Lamp improve your accident rate at night? What more proof do you need to know the study is flawed?
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This does not discredit the study. There is good reason to include nighttime crash statics in an analysis of DRLs. For example:
1. Many DRLs are controlled by a light sensor, which automatically turns on full wattage and activates marker lights during dusk/dawn/night. With nothing to forget, the driver's risk could decrease.
2. Drivers with DRLs that aren't controlled by a light sensor may forget to turn them on. This leaves their car with headlights at half power and no tail/marker lights during dusk/dawn/night hours. The driver's risk could rise.
3. Headlamps burn out more quickly with DRL than without. If a lamp burns out at dusk/dawn/night, the driver's risk could rise.
4. Including nighttime statistics also eliminates the variables of winter/summer daylight hours and the need to define "dusk" and "dawn".
Most of these variables were called out in the study ... didn't you read it?