Dumb SLF here so apologies. If my car can know if it is wandering out of the lane I'm driving on, there must be a technical solution to an aircraft being say, 50m left or right of the track it should be on for the runway rather than the taxiway? Why does aviation seem so slow in adopting better technical solutions to the problems in front of it? Coloured lights (imperfect, as pointed out further up this chain) do seem a bit yesterday?