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
Aintree Motor Racing Circuit the British Grand Prix and a round of the Formula 1 World Championship, whilst driving a British car, a Vanwall. The 1957 Grand Prix also took the title of Grand Prix de Europe and was the premier Formula 1 event of the season, attracting 150,000 spectators. The full Grand Prix circuit was last raced on in 1964, but part of it (the Club Circuit) is still open and was used for racing until the early 1980s, having been operated by the Aintree Circuit Club from the mid-1960s to the late 1990s. In the 1980s the 108 Car Club (St. Helens)