Each time I boot up the game, I have to go to Settings/HUD & Gameplay, and toggle off the Stop Marker (the traffic light coloured stopping zone), even if it is turned off in the main menu, it is back on again once you load up a route. This bug has been a thing for months, if not years, as I'm pretty sure I remember it going back through various versions of TSW.
The rainbow stopping marker turns itself on whenever you play a tutorial, could this be the issue? I haven't heard of this issue, but that could just be me. If you are fortunate enough to have a keyboard plugged into your console, you can press Ctrl+7 to toggle the rainbow stopping marker.
I have been playing a lot of tutorials recently, I'll have to see if it stays off for the main content, thank you for the heads-up!