Circuit de Monaco downhill again to a double right-hander called "Portier," named after region of Monaco, before heading into the famous tunnel, a unique feature of a Formula One circuit. (Until 2009 only one other circuit, Detroit in 1982–88, featured a tunnel, but the F1 series now includes racing at the Yas Marina Circuit in Abu Dhabi, which presents a shorter tunnel at the exit of the pit lane.) As well as the change of light making visibility poor, a car can lose 20–30% of its downforce due to the unique aerodynamic properties of the tunnel. The tunnel also presents a unique problem
Rufforth Circuit Rufforth Circuit Rufforth Circuit is a disused motor racing circuit built on an airfield in North Yorkshire, England. Rufforth circuit was built on the site of a World War II bomber base, RAF Rufforth, opened in 1942. The airfield remained in active service after the war, eventually closing in 1954. Rufforth circuit opened in 1959, and held races until 1962. The circuit hosted Formula 2 and Formula Junior races between 1961-1978 as well as numerous sports car events. The circuit was one of many of Britain's airfields to be transformed into motor racing venues. The original track layout of Rufforth