Gotta weigh in on DRL here. The statement about the"first, last, and only study" is a bunch of bull. One of the early controlled experiments was from Greyhound. My dad owned stock in them and all kinds of interesting stuff showed up in the mail. They studied their fleet with and without DRL. A nice, controlled test - same vehicles, same routes. Using DRL resulted in a 5% reduction in accidents. The cost and pollution arguements could be applied to almost anything in a car. There is a certain cost to safety and it's based on the good to society as a whole. The 2 or 3 replacements is also fradulent. It was estimated that full voltage low beams would have to be replaced 2 or 3 times in the life of a car and that was considered unacceptable. That's why reduced voltage systems were designed. No anticipated bulb failure in the life of the car.
