[Answer] What determines airport runway numbering?

Step 1 : Introduction to the question "What determines airport runway numbering?"

...The large white numbers painted on the ends of runways are designated by taking the compass bearing and dropping the last number. Larger airports often have two or more parallel runways oriented the same way, so to distinguish them, the letters L (left), R (right), and C (center) are added after the number. Most runways also can be used in either direction to take advantage of winds, so they have two numbers.

Step 2 : Answer to the question "What determines airport runway numbering?"

Compass bearing:

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