The Blind Spot Detection System detects traffic situations that could pose a risk if the driver changes lanes. Such traffic situations include vehicles approaching quickly from behind or vehicles in the driver's blind spot. An illuminated triangular warning LED appears in the exterior mirror if there is a vehicle in this critical area. Still have questions? Call our BMW Genius Hotline at 1.844.4GENIUS (443-6487) Available Monday through Thursday 9:00am-9:00pm (EST), Friday 9:00am-6:00pm (EST), and Saturday 10:00am-7:00pm (EST) For portable assistance available anytime, anywhere download the BMW Genius App at bmwgeniusapp.com If you would prefer to send us an email, please contact: bmwgenius@bmwusa.com 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: ht...