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
Lippo Village International Formula Circuit Lippo Village International Formula Circuit The Lippo Village International Formula Circuit is a defunct street circuit in Lippo Village Tangerang, Indonesia. The track was confirmed to host a round of the 2008–09 A1 Grand Prix season, set for the weekend of February 8, 2009. On August 29, 2008, further details regarding the track were announced. Designed by Hermann Tilke, the track would be made by modifying parts of the village near the Pelita Harapan University and includes the Supermal. It is located at the centre of Lippo Village's hub. Tilke attempted to keep disruption minimal to the village during the