Lanes of normal width are covered by the sensors
Narrow lanes: side assist may react to vehicles travelling two lanes away
The side assist system is designed to cover adjacent lanes of normal width on both sides of your vehicle (left and right), regardless of whether you are driving directly in the centre of your lane or further to one side.
If the lane widths are reduced, the sensors may also detect vehicles in additional lanes, especially if you are driving further to one side of your lane ⇒ fig. 173. In such situations the system may react to vehicles travelling two lanes away, so that the side assist activates the information or the warning mode.
Similarly, if the lanes are very wide, it is possible that the system may not detect vehicles in the adjacent lane because they are outside the area covered by the sensors.