Going back about ten years now, we had a batch of VW T5.1 vans delivered. Almost over night we had piles of near miss reports in the office (which up 'till then were almost unheard of) and almost all had one common denominator.
Random vehicle pulling out in front of van when turning right on roundabout.
It didn't take much head scratching to work out why. These were fitted with daytime running lights. These lights were white, 4" x 4", and 21w. The indicator was directly beside it, 4"x3" with a 21w orange bulb. Result - Invisible indicators unless you are viewing from directly in front. Fixed by replacing the drl bulbs with 10w., instant cure. Then we tried some Transits. Oh dear. The drl lights on these are the main beam lights on reduced current! Still the main beam lenses for goodness sake. What are they thinking?
And what's going to happen when the american idea of the 'drl lights going out every time the handbrake is applied' catches on??? More flashing lights than a cheap 70's nightclub.
(Don't let on, but I drive a Range Rover).