Today, I had a near miss because an idiot in front me of me had exactly one of three brake lamps working. He also had near-black tint on his front windows (technically illegal in MI) and non-functioning hood pins. On a battered Mercedes 200-series!
I would not advocate emissions testing to qualify for vehicle registration, but I am thinking now that mandatory safety inspections may be a good idea.
Should we let people drive with bald tires? Dead brake lamps? Dead headlights? Undamped, bouncing wheels? Worn out brakes? Ridiculously high lift kits that could result in decapitations in a collision with another vehicle?
I'm all for individual freedom, up to the point when people's poor maintenance or poseur engineering endanger the others on the road.