Another example of why this is a beta product and the requirement to drive alert when using (as an aside, I've got 10K miles on X, much of it on I75/I95 to and from FL to NC), particularly when traversing new roads/roads that you are not familiar with. Setup: Just over FL/Ga border & near mile marker 363 where newer concrete pavement has been laid. Please note that the road is properly striped. It's 10:30AM (Sunday) traveling South, 90+ heat, significant sun at around 10 o'clock driver's side. I was in left lane using AP near where road splits to I295 loop. I was following a vehicle in front of me traveling at speed limit with cars in adjacent lane to right. Action: All of a sudden, the car in front of me makes a beeline to get to far right hand lane to get to I295 split. Instead of staying in left lane, my X makes a decision to sharply follow that car right. Unless I had taken over I believe would have hit the car adjacent to me in the next lane over. After adjusting and regaining composure, I quickly looked at screen and saw that road striping was dimmed and I was unable to re-engage AP. It appears that the white concrete roadway coupled with intense sun facing car was impacting the X's ability to traverse the road properly. This continued until I hit the end of the newer white concrete (around exit 337) where the roadway transitioned to blacktop. At that point, and despite the same sun conditions, the vehicle recognized the lanes/striping and AP could be reengaged.