The majority of modern Formula One cars use seven-speed
semi-automatic gearboxes. Regulations stipulate a maximum of seven
forward gears plus reverse. Continuously Variable Transmission (CVT)
systems are not allowed and cars may have no more than two driven
wheels. Transmissions may not feature traction control systems, nor
devices that help the driver to hold the clutch at a specific point to
aid getaway at the start of the race.
For safety reasons all cars
must have a means of disengaging the clutch that is operable from
outside the cockpit by marshals. This control is usually situated just
ahead of the cockpit opening and is marked on the car’s body by a red
letter "N” within a white circle.