The invention deals with the field of systems for detecting the position in which a road accident occurred along ordinary roads, and in particular along motorways. The system provides for the installation, along guard-rails or barriers made of reinforced concrete (1), of an electric circuit or a circuit for emitting a signal (2) placed in order to be easily interrupted by a motor vehicle impact. The circuit interruption activates a processor (3) that processes electric data to determine the accident position and transfers these data to signalling circuits.

The signalling circuits can be of two types: signalling circuits (4) along the road route being surveyed, signalling circuits (5) located in assistance departments such as Traffic Police Stations, Fire Brigade Stations, First Aid Stations, etc.