Lights up
I hate daytime running lights, although for a somewhat contradictory reason. I certainly think it’s a grand idea for people to have lights on, particularly in fog and rain when they might not otherwise think of it, but the problem is that daytime lights aren’t bright, and usually they don’t turn any lights on in the back of the car. So a person gets into the car, fires it up, notes that their daytime lights are piercing through the fog sufficiently, and then drives off, not thinking a whit about the fact that they are virtually invisible to traffic behind them.
This is insanely dangerous; I was once travelling up I-95 on a Sunday morning in heavy, heavy fog. There was little traffic, but even my speed-demon self was driving a careful 50mph (as opposed to my normal 65+), but that didn’t keep me from nearly destroying a family in a Honda who were driving no more than 30, with no lights on whatsoever. They were completely invisible until I nearly rear-ended them.
