DRLs came into being thanks to Volvo. If you look at an older Volvo (think 244/5) you will see that it appears to have the parking lights on all the time that it is driving. In fact they have a dual wattage globe in the front park light, giving (from memory) 21 watts in the DRL position and 5 watts when set to park / headlights.
Audi are now using LED DRLs in their current range and HSV have started doing so as well.
I don't think the lights mounted below the bumper line (with a 55 watt globe and a highly polished reflector) could ever be called DRLs. They are fog lights or driving lights.
Fog lights are to be used in conjunction with park lights (not low beam) and only in times of poor visibility (heavy rain, fog, smoke, etc).
Driving lights are to come on with high beam only.


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