Anti-collision systems have been going through a test program under real life conditions, or 'field operational test'. An alarm for collision which sounds when the driver is approaching too close to the vehicle ahead is a new device. the speed is changed automatically by an adaptive cruise control in order to maintain a safe distance from the upcoming vehicle.A lane departure warning system alerts the driver when the vehicle begins to stray from the lane.But some kind of human interaction is required as these systems are not fully automated. Much research is still required before we see widespread use by the general public.
Collision warning/collision avoidance (CW/CA) systems target a major crash type and their development is a major thrust of the Intelligent Vehicle Initiative. adaptive cruise control systems already available have been naturally extended to these. Evaluations of the algorithms for collision avoidance have been usually based on subjective ratings.

for more details, refer these:
http://ec.europa.eu/research/star/index_en.cfm?p=55
http://www-personal.umich.edu/~hpeng/VSD...uation.pdf
http://eurofot-ip.eu/en/the_project/
http://fmcsa.dot.gov/facts-research/rese...ystems.htm