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
Sepang International Circuit Sepang International Circuit The Sepang International Circuit () is a motorsport race track in Sepang, Selangor, Malaysia. It is located approximately south of Kuala Lumpur, and close to Kuala Lumpur International Airport. It hosted the Formula One Malaysian Grand Prix between 1999 and 2017, and is also the venue for the Malaysian Motorcycle Grand Prix, the Malaysia Merdeka Endurance Race and other major motorsport events. The circuit was designed by German designer Hermann Tilke, who would subsequently design F1 venues in Shanghai, Sakhir, Istanbul, Valencia, Marina Bay, Yas Marina, Yeongnam, Greater Noida, Austin and Baku. The circuit was officially inaugurated