#2 is already a thing in Europe, (for example on Heathrow you can hear ATC say "follow the greens", which will guide the planes to the correct Runway entrance:

#2 is already a thing in Europe, (for example on Heathrow you can hear ATC say "follow the greens", which will guide the planes to the correct Runway entrance: https://youtu.be/7pX9hxn-cmE?t=363 https://youtu.be/7pX9hxn-cmE?t=363) Or this one, showing how it works in foggy condition: https://www.youtube.com/watch?v=2W2ak94xTXM https://www.youtube.com/watch?v=2W2ak94xTXM And an explanation of the system: https://www.youtube.com/watch?v=zAn1mfBDDkc https://www.youtube.com/watch?v=zAn1mfBDDkc