In general, the lines are IMO blue if the system recognizes them, and then it will steer quite reliably; AS in other cars the system has naturally limitations, and low sun, wet surfaces, worn markings etc. will interfere with the system. The tug on the steering wheel will occasionally also happen without a blue line, like the car recognizes you cross something, but the line was not clear enough for lane centering to work; IMO the MG system works fine for what it is, I have had systems that work a lot less reliable in more expensive cars (I'd say esp. teh lane centering/following is above what you get at this price usually, and the adaptive cruise less jerky, and a Mercedes EQE rental constantly would loose the lines and telll me to take care myself e.g.), having driven a full FSD Tesla Y Juniper in California recently there is ofcourse a long way to the top though.
