2009 BMW 5 Series Owner's Manual - Page 109
2009 BMW 5 Series Manual
Page 109 highlights
stating that the system is not active until this speed is reached. A warning will be canceled: > after approx. 3 seconds > if you return to your lane > if you brake heavily System limits The leaving lane warning cannot serve as a substitute for your personal judgment in determining the course of the road. If the system issues a warning, do not move the steering wheel with unnecessary severity, as otherwise you could loose control of the vehicle.< The function of the system may be limited in the following example situations: > with worn-away, poorly visible limit lines, or lines that run together or apart or are unclear, e.g. in road construction areas > when limit lines are covered by snow, ice, dirt or a great deal of water > in tight curves or on narrow roads > when limit lines are not white > when limit lines are covered by objects > when driving up close behind a vehicle driving ahead > with bright counter light > when the windshield is fogged up, dirty or covered with stickers, vignettes etc. in the area of the inside rearview mirror 107 Online Edition for Part no. 01 41 2 600 721 - © 08/08 BMW AG Reference Mobility Communications Entertainment Navigation > in heavy fog, rain or snowfall Driving tips Controls > if you signal At a glance