For the record, there's a highway near my home which is tagged as "daylight safety section" and there are signs stating that you're required to turn on your lights at all times on that road. I've heard of people getting ticketed for failing to heed the signs.

In the case of that particular stretch of road, I can understand it. It's rather dangerous. Narrow but high traffic, and traveled at high speeds. I think that tagging specific road sections makes more sense than requiring DRLs on all cars.