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
Circuit de Monaco Circuit de Monaco Circuit de Monaco is a street circuit laid out on the city streets of Monte Carlo and La Condamine around the harbour of the principality of Monaco. It is commonly referred to as "Monte Carlo" because it is largely inside the Monte Carlo neighbourhood of Monaco. The circuit is used on two weekends in the month of May of each year to host the Formula One Monaco Grand Prix and Formula E Monaco ePrix (odd years) or Historic Grand Prix of Monaco (even years). Formula One's respective feeder series over the years – Formula Two, Formula 3000