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Starting lines on an all-weather track

An all-weather running track is a rubberized, artificial running surface for track and field athletics.

It 2️⃣ provides a consistent surface for competitors to test their athletic ability unencumbered by adverse weather conditions.

Historically, various forms of dirt, 2️⃣ rocks, sand, and crushed cinders were used.

Many examples of these varieties of track still exist worldwide.