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
Circuit Pau-Arnos Circuit Pau-Arnos Circuit auto et moto Pau-Arnos is a club track in Arnos about 20 km to the west of the city Pau in southwestern France which is famous for its street circuit Circuit de Pau-Ville where the Pau Grand Prix is held. The speed track for automobile and motorcycles is up to 3030 m long and was opened in 1986. The nearby kart track is up to 900 m long. The site hosts track days, test drives, minor competitions, and a race driver school. The lap record (1:10,87) was set by Giedo van der Garde in 2005 during Formula