It's not silly. It is simply unnoticeable in peak evening rush hour traffic, when every car is driving with high beams. Trust me, I've had that experience on my Getz (which was running 100/90w, btw) and for 2-3 days, I could not even realize that it was my headlight bulb that was blown. There is sufficient light on the road to fool you. Quite simply, would you know if your brake light bulb is fuse, unless someone points it out? Headlight bulbs fall in the similar category dude.