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
Shanghai International Circuit in the run up to the corner. Turn 16 is the last corner – a fourth-gear left-hander which requires a quick tap on the brakes – braking early can be more effective as you can then carry more speed through the corner and then down the pit straight. The total length of the circuit is 5.451 km (3.387 mi), which is about average for a Formula One circuit. Michael Schumacher's lap record at the circuit was broken after 13 years in 2017 by Mercedes-AMG driver Lewis Hamilton, who completed one lap of the circuit in 1:31.678. Hamilton's record was broken