Cars could soon come with parental controls that limit what younger drivers can do with a vehicle.
Developed by Ford, the MyKey system limits a car's top speed, how loud its stereo can be and sounds warnings if seatbelts are not being worn.
Ford will introduce the controls on some US makes of car that are due to debut in 2009 but go on sale in 2010.
The Ford Focus will be the first to have MyKey, but the car maker said it would become a standard feature.
The main element of the MyKey system is to limit the top speed of a car to 80mph.
Ford says other options allow parents to limit the volume on the car stereo and make the car sound a continuous alert if drivers and passengers are not wearing a seatbelt.
Other options will let parents decide if warning tones should sound if a car goes faster than 45, 55 or 65 mph.