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
Marina Bay Street Circuit the exit of turn 21, therefore most of the drivers exit turn 21 very close to the wall to gain a speed advantage. Running down towards turn 22 passes the 165m tall Singapore Flyer, where turn 22 and 23 is taken flat-out at about before picking up the throttle again towards the pit straight across the finish line. Marina Bay Street Circuit The Marina Bay Street Circuit (otherwise known as the Singapore Street Circuit) is a street circuit around Marina Bay, Singapore, encompassing the planning areas of Downtown Core (Turns 4 to 23) and Kallang (Turns 1 to 3). It