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
Valencia Street Circuit the infrastructure buildings for the circuit. The 2012 edition took place on 24 June and was the last to go under the name of the European Grand Prix until 2016, when the Baku City Circuit used the title for one year. It has not been used since 2013 after a deal fell through to alternate this venue with Catalunya in Barcelona to host the Spanish Grand Prix. The deal to host the Valencia race was signed on 1 June 2007, and was for seven years. The deal was made between Formula One supremo Bernie Ecclestone and the Valmor Sport group,