From Around the Web: 20 Awesome Photos of running tracks

https://www.goodreads.com/topic/show/19988029-12-do-s-and-don-ts-for-a-successful-running-athletics-facility

Asphalt - Now you would think that asphalt is just as bad as concrete, but it is not. It's in fact about 8 times "softer". The genuine problem with operating on asphalt roadways is not the solidity, but the camber