http://translogic.aolautos.com/2011/06/22/fords-v2v-system-helps-driver-avoid-collisions-video/

Something like TCAS on aircraft, isn't it?Liked the concept.Would help driving especially during low visibility and on narrow roads as well.

i my last company we shipped this kind of project, that was best of my creation and still catch lot of curiosity in my resume . Anyways this kind of system has limitations that both the vehicles should have this system installed.