Volkswagen Golf GTI 2016 Owner's Manual page 914

Fig. 164 In the front windshield: Area of the Lane Assist camera.
Please first read and note the introductory information and
heed the WARNINGS →
Introduction
With the help of a camera → Fig. 164 , Lane Assist can recognize
possible side markings of the current drive lane. Should the vehicle
leave this area unintentionally, for example, when leaving the
current drive lane without activating a turn signal, the system will
warn you with a corrective steering intervention. The driver can
override the corrective steering intervention at any time.
When adaptive lane tracking is active → Switching adaptive lane
tracking on and off , Lane Assist does not just provide assistance
when the vehicle is at risk of leaving the lane. The feature provides
continuous assistance while driving if 2 lane markings (one to the
left and one to right of the vehicle) are detected by the system.
Lane Assist will not warn you of a lane change if you activate the
turn signal, because the system will assume that the lane change is
happening intentionally.