I'm still always surprised just how much rubber is allowed to accumulate. Here's a snapshot of one of the Zurich runways: https://www.google.com/maps/@47.47922

I'm still always surprised just how much rubber is allowed to accumulate. Here's a snapshot of one of the Zurich runways: https://www.google.com/maps/@47.4792249,8.5411849,660m/data=!3m1!1e3 https://www.google.com/maps/@47.4792249,8.5411849,660m/data=... Scroll a little NW or SE to see what the actual color of the runway is underneath all the rubber.