Play structure - the structure of the site

Track and Field runway surface structure, the development of cinder from the soil, lime, clay Aile park equipment layer. With the development of science and technology, the early 1960s there has been plastic track, eighties athletics track curve radius from 36 meters to 37.898 meters, but also the development of 36.50 meters. Experience has shown that the majority of 400 meters semicircular runway was Aile outdoor playgrounds bend radius of 35 meters to 38 meters between is appropriate, as the proposed construction of the IAAF radius of 36.50 m runway. Runway of the three different radii are known as "400 meters standard semicircular track and field." Used in all kinds of athletics venue currently held in the international and domestic, mostly above the runway radius.