Vehicle Over-Speed Warning Devices.
Many later vehicles are fitted as standard with an audible over speed warning system. These devices monitor vehicle speed and warn when a predetermined speed set by the driver has been exceeded. These systems offer the obvious benefit of making the driver aware of excessive speed and may be beneficial in preventing speeding.
For vehicles that are not fitted with an over speed warning, a number of aftermarket systems are available. The difficulty, and therefore the cost, of installation will vary from vehicle to vehicle.
Also check out: