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
Hanoi Street Circuit Hanoi Street Circuit The Hanoi Street Circuit (Vietnamese: "Đường phố Hà Nội)" is a motor racing venue located in the Nam Từ Liêm district of Hanoi, the capital of Vietnam. It is a street circuit designed to host the Vietnamese Grand Prix, a round of the Formula One World Championship. The circuit is 5.565 km (3.458 mi) long and was designed by circuit architect Hermann Tilke, who has designed every circuit added to the calendar since 1999. The Hanoi Street Circuit is expected to make its début on the Formula One calendar in 2020. The circuit is next to the