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 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 is the venue for the Singapore Grand Prix. The track is long in a harbourside location similar in style to the Circuit de Monaco and the Valencia Street Circuit. The circuit is designed by KBR, Inc., a modification of the original one first proposed by Hermann Tilke. The circuit has a FIA Grade 1 license. The circuit holds