Automatic emergency call system for motor vehicles

The invention proposes an emergency call system for a motor vehicle for automatically transmitting an emergency call to an external receiving station. The motor vehicle has measuring means, for example in the form of a radar system (6), for determining the relative speed and the distance of the vehicle in relation to another vehicle or an obstacle. If the current relative speed exceeds a predetermined limit value for a given distance, it is assumed that a collision is unavoidable, and an emergency call by a transmitter (3) provided in the motor vehicle is activated. Advantageously, the vehicle position, ascertained by means of a navigation system (4), is transmitted to the receiving station with the emergency call. The invention also provides for the emergency call system to be connected to further sensors (6), suitable for detecting a collision, so that the emergency call can be revoked if an actual collision is not reported by such a sensor within a predetermined time period.