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
Zhuhai International Circuit Zhuhai International Circuit Zhuhai International Circuit (ZIC) (珠海國際賽車場) is located at Jin Ding town in Zhuhai City, Guangdong Province, China. Motorsport started in Zhuhai when it hosted a race on its street circuit in 1993, racing continued until 1996 when the motor racing circuit was constructed and became China’s first permanent motor race track with Formula One in mind. The circuit is designed by Australian company Kinhill Engineers Pty Ltd, the same group which created the Formula One circuit in Adelaide. The project manager for the project was Michael McDonough. The first international race held at the circuit was the