A device for the communication signal-based position determination of objects in road traffic, comprising a communication unit for wirelessly receiving and transmitting data-transporting communication signals and for wirelessly receiving reflection signals of the communication signals, the reflection signals being reflected by objects, location determining means for determining locations of senders of the communication signals, and position determining means for determining the device's own position, a propagation time difference determining means, and the device is configured to determine the position of the objects.