The Underground Racing League (URL) is a set of tournaments which takes place in a specific set of closed tracks outside city streets - either actual racing circuits or airport runways.
Balapan Underground Racing League (URL) adalah serangkaian turnamen yang berlangsung di sebuah set tertentu di lintasan tertutup di luar jalanan kota - baik sirkuit balapan sebenarnya maupun landasan bandara.