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
Mugello Circuit the walls are so close and you will smash into the tyres. It is not for Formula 1 and, if you lost the steering or the tyre pressure dropped or whatever, then it will be a big crash." Nevertheless, it holds a grade 1 FIA license, meaning it meets the standards to host a Formula 1 race. An unofficial track record of 1:21.035 was set by Romain Grosjean during the test. The winners of the Mugello Grand Prix for automobiles ("1919–1969: Circuito del Mugello, 1974–present: Gran Premio del Mugello") are: Mugello Circuit Mugello Circuit () is a race track in