Volvo invented daytime running lights, but regrettably used the headlights for this function. So when the car is fitted with Xenon headlights they not only blind oncoming drivers at every pothole and speedhump, they are also on so much that they inevitably fail with expensive consequences. The answer is entirely separate DRLs, either using plain lights as on the FIAT 500, or LEDs as fitted to Porsches, Mercedes, Citroens and Renaults.