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
Bahrain International Circuit by Valtteri Bottas, set during qualifying for the 2017 edition (1:28.769). The Bahrain International Circuit hosts a number of high-profile series, including the FIA Formula One World Championship, the FIA World Endurance Championship, the FIA Formula 2 Championship, Chevrolet Lumina Series, Thunder Arabia and Radical. Also every year there is the traditional 24 Hours of Bahrain. In the past the circuit has hosted the FIA GT Championship, Speedcar Series, Australian V8 Supercars, GP2 Asia Series, and a one-off Bahrain Superprix involving Formula Three cars, following on from the collapsed Korea Super Prix. The first ever Formula BMW World Final took