Removing rubber from runways - GIF

Removing rubber from runways.

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Previously:

1945 floating runway - GIF
Airplane runway crash into snowbank - GIF
C-130 dumps tank on runway - GIF
Highway intersecting runway - photo
Plane scrapes runway while landing - GIF
Plane skids off runway and crashes into helicopter - GIF
Runway snowblower - GIF

Why remove it, F1 circuits & drag strips get faster as more rubber is deposited on the track.
Have you ever thought about what happens to all the rubber that's worn off car & truck tyres, it's not deposited on the road like on a runway, but must comprise small particles of dust that we breathe and makes buildings and cities dirty.