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Keirin Racing

From WikiPedalia

A popular Japanese form of track racing. Keirin races are partially paced by motorcycles. This is one of the few human athletic events at which pari-mutuel betting is legal.

The governing body of Keirin racing is N.J.S. (Nihon Jitensha Shinkokai-the Japanese Bicycling Association.)

For more details, see the Wikipedia entry for Keirin.