Quartix provides an easy-to-understand, color-coded score for each vehicle or driver in a fleet, allowing fleet managers to instantly recognise which drivers need to improve their skills. The vehicle tracking system monitors the speed of a vehicle every second. The system then calculates: The number of times per hour that the speed changes by more than a given amount between one second and the next; How severe the changes are; How long the vehicle has been driving. This calculation becomes the acceleration index and the braking index.