Speed indicator system using GPS signals for indicating the speed of a vehicle to persons outside the vehicle

A speed indicator system (1; 2) for indicating the speed of a vehicle to persons outside the vehicle, the system comprising one or more input means (10, 40) for generating one or more input signals from which the speed of the vehicle is derivable, processing means (20) connected to the input means (10, 40) for determining a speed value from the input signal(s) and display means (30; 60) connected to the processing means (20) for displaying the speed value to persons outside the vehicle, the input means comprising a global positioning device (10) which is provided to communicate with satellites in a global positioning system for generating successive positions as first input signal for the processing means (20), and the processing means (20) being provided for determining the speed value from the successive positions.