"Road surface changes" refers to alterations or variations in the physical condition of a road, such as different types of pavement, repairs, or uneven surfaces. Full definition
The system is included as part of the Lane Departure Prevention system, not only adjusting for unintended lane drift, but also making finer adjustments for minor road surface changes or crosswinds (as detected by the camera - based, lane marker detection system). (automobilemag.com)
The system goes beyond the traditional Lane Departure Prevention system, taking it a step further by not only evaluating the road ahead (the camera is located above the rearview mirror) for unintended lane drift but also by making small steering input angle adjustments if the Q50 undergoes minor direction changes due to road surface changes or crosswinds (as detected by the lane marker detection system). (automobilemag.com)
If, for example, the road surface changes from a thin layer of snow to a gritted section and then to a section covered with a thick layer of snow, AdSR will select different modes for each surface2. (autonationdrive.com)