I think the real problem is that daytime running lights are only at the front of the car. Something I have never understood. they should be front and rear.
Buy a Volvo, they are.
One of the problems with auto headlights is that they may not be on when they really should be and a lot of drivers do not think. I once followed a large Japanese 4x4 utility for quite a number of miles from Evesham to Stoneleigh. Variable fog thickness. One could tell when the car detected thicker fog as the tail lights came on. However, when light levels lifted a little, despite the fog still being quite thick, they would go off again, usually prompting flashed headlights from a few oncoming vehicles. 4x4 driver seemed oblivious to what was going on. Mind you that was probably a normal situation...
