Daytime Running Lights changed ???

[Wisha Haddan H3]

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?

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?