I picked up this Subaru Impreza EyeSight demo toy in Japan. As of today this option is only available in the US on the 2013 Subaru Legacy Limited, but this JDM Impreza toy suggests that Subaru has more applications in the works.

What is EyeSight? It's a collision avoidance system that's based around stereo cameras that are mounted inside on either side of the center rear view mirror. Together they measure following distance in adaptive cruise mode and they keep track of lane markings in order to issue lane departure warnings. Should you mistakenly shift into "Drive" when backing out of your garage, the system is reportedly able to intervene to prevent you from driving through your garage wall.

They're also tied into the brakes in order to stop the car from rear-ending the car ahead if you space out at the critical moment in low speed stop and go situations. I didn't get to try it out, but here's what the toy does.