Method for assisting a user of a first motor vehicle (10, 14) in the operation of the first motor vehicle (10, 14), which is located in a geographic region, comprising the steps: - sensing of at least one measurement value by a sensor device (24, 28) of a second motor vehicle which is also located in the region, - generating a sensor signal describing the measurement value by means of a control device of the second motor vehicle, - transferring the sensor signal to the motor-vehicle-external data server device (16, S3), wherein the method is characterised in that the sensor signal generated describes a current position of the second motor vehicle and is characterised by the steps carried out by the motor-vehicle-external data server device: - dividing the geographic region into several geographic sectors (22, 22', 22", S1), - receiving a request signal from the first motor vehicle (10, 14), wherein the first motor vehicle (10, 14) at the time of the transfer of the request signal is not prepared to sense a measurement value of the same type, and wherein the request signal describes a current position of the first motor vehicle (10, 14), - determining, based on the current positions of the motor vehicles (10, 12, 14), whether the motor vehicles (10, 12, 14) are located within the same geographic sector (22, 22', 22"), - if the first motor vehicle (10, 14) and the second motor vehicle are located within the same geographic sector (22, 22', 22"), transferring the sensor signal to a control device of the first motor vehicle (10, 14, S6), - determining a respective number of motor vehicles in at least one of the geographic sectors (22, 22', 22"), wherein each of the motor vehicles is prepared to sense a measurement value of the same type, and - if the determined number of motor vehicles falls below a predefined minimum number, generating a control signal for controlling one of the motor vehicles (12, 14) to increase the number of motor vehicles (12, 14) which are prepared to sense the measurement value of the same type. - sensing of at least one measurement value by a sensor device (24, 28) of a second motor vehicle which is also located in the region, - generating a sensor signal describing the measurement value by means of a control device of the second motor vehicle, - transferring the sensor signal to the motor-vehicle-external data server device (16, S3), - dividing the geographic region into several geographic sectors (22, 22', 22", S1), - receiving a request signal from the first motor vehicle (10, 14), wherein the first motor vehicle (10, 14) at the time of the transfer of the request signal is not prepared to sense a measurement value of the same type, and wherein the request signal describes a current position of the first motor vehicle (10, 14), - determining, based on the current positions of the motor vehicles (10, 12, 14), whether the motor vehicles (10, 12, 14) are located within the same geographic sector (22, 22', 22"), - if the first motor vehicle (10, 14) and the second motor vehicle are located within the same geographic sector (22, 22', 22"), transferring the sensor signal to a control device of the first motor vehicle (10, 14, S6), - determining a respective number of motor vehicles in at least one of the geographic sectors (22, 22', 22"), wherein each of the motor vehicles is prepared to sense a measurement value of the same type, and - if the determined number of motor vehicles falls below a predefined minimum number, generating a control signal for controlling one of the motor vehicles (12, 14) to increase the number of motor vehicles (12, 14) which are prepared to sense the measurement value of the same type.