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
GP3 Series advantage of the infrastructure, such as marshals and medical facilities, in place for the Formula One events. GP3 Series mainly raced on European circuits, but had appearances on other international race tracks as well with their most recent races in the only 2015 season at the Bahrain International Circuit in Bahrain and the Yas Marina Circuit in United Arab Emirates since 2010 season. The series were planning for more international races such as Albert Park, Austin, Interlagos, Marina Bay, Mexico City, Montreal, Shanghai and Suzuka. Many drivers had since stepped up to GP2 since the series began, with the 2010