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
Davidstow Circuit Davidstow Circuit Davidstow Circuit is a disused motor racing circuit and airfield built in Cornwall, in the United Kingdom. The circuit was built on the site of a World War II RAF Coastal Command base, RAF Davidstow Moor, opened in 1942. Davidstow circuit opened in 1952, and held three Formula 1 races between 1954 and 1955. The circuit hosted its last race in 1955, and was one of many of Britain's airfields to be transformed into motor racing venues. Davidstow circuit is notable for the first victory in a Formula One race by a Lotus. The original track layout of