Dude, you are freaking me out. Not trying to play God's gift to aviation here, but a professional pilot should pay attention to detail. If you just completed a low RVR landing and your taxiway centerline is solid white ... You might be scratching your wingtip on something, or about to come nose to nose with a car. Same with your cockpit lights, steady amber, flashing amber, steady red ... Different color for a different action
I hear you Messa, don't want to 'assume', maybe a white X stands for 'free topless plane wash'. Btw, on a grass runway you dont put Xs, you put cows. (even if with a bad play on words some of your Exs could be cows).
They could have used the Meigs Field "Daley method".
If you hit a car you arrive at a wreck. If you hit a cow, you just arrived at a BBQ. I vote cow.
I vote cow too!http://www.youtube.com/watch?v=jGhMb06ZLBY
Wow, you guys need help.
Look at the runways in Appalachicola Municpal Airport in Florida. They have both white and yellow X's on the closed runways.
Yellow paint on the paved areas of an airport usually designate a place where aircraft are not to operate whether by design or because of repairs.