It's the ONE feature I wanted (along with side mirror anti-collision) that I think SHOULD BOTH be mandated specifically for the reason you stated!My Favorite feature however, is the Automatic emergency braking. The other day, I was looking at a billboard and suddenly my Jeep suddenly stopped quickly, just behind a guy that suddenly slammed on his brakes to make a sudden left turn. It really saved us from rear ending this jerk. The Jeep made a loud beeping town and stopped itself. That was amazing to me.
I'm not even sure if I could after-market this feature,... Even if I COULD, I couldn't afford the $1,000 plus price tag of the two brake-lights alone. Sure, it would up the price tag, but in quantity on every vehicle would make the cost nominal as air bags now are. No one complains that air bags increase the cost of vehicles. Maybe one day a ways back they did, but who would want a car WITHOUT an airbag? Just my $0.03 ;-)