Method for operating a start stop system of a motor vehicle and motor vehicle

The method involves detecting traffic congestion, receiving movement state information from additional road users located in front of the motor vehicle (1) through a wireless communication device (8). The received movement state information is evaluated, and the congestion information describing a dissipation and a movement phase of the traffic congestion is determined. The engine (2) is automatically started and an indication is outputted to the driver corresponding to the congestion information. An independent claim is included for a motor vehicle, which comprises a communication device and a start-stop system with a control device.