The Frontal Collision Warning with City Mitigation is a camera based system that delivers acoustic and visual warnings to the driver as well as braking intervention at city speeds. It provides both a Preliminary Warning and a Secondary Warning. Looking for a quick answer? Check out our FAQ page : faq.bmwusa.com Need further help? Contact us here: bmwusa.com/contact-us.html You can also refer to your owner's manual or visit: bmwusa.com/owners-manuals.html Connect with BMW USA: Website: bmwusa.com Facebook: facebook.com/BMWUSA Twitter: twitter.com/BMWUSA Instagram: instagram.com/BMWUSA Tumblr: BMWUSA.tumblr.com