The Road Racing Series (formally Enduro Series) is different from the other four WKA national touring series. Laydown-enduro and sprint-enduro karts are built specifically for enduro-style road racing... moreThe Road Racing Series (formally Enduro Series) is different from the other four WKA national touring series. Laydown-enduro and sprint-enduro karts are built specifically for enduro-style road racing. Enduro-style road races are not held on sprint-style courses, but longer road courses typically built for race cars that are between 1.5 and 4.5 miles (7.2 km) in length. Gearbox (shifter) karts and Touch-and-Go (TaG) sit-up style karts also compete at Road Racing events. It is not uncommon for 40 to 50 different classes to compete throughout the course of a Road Racing weekend. less