System for ascertaining traffic information, comprising a terminal carried along in a vehicle and having a position determining device for determining a vehicle position of the vehicle in a road network, having a storage device for storing reference positions defined by spatial coordinates, having a processing device, which cooperates with the position determining device and the storage device and which is configured to compare a determined vehicle position with stored reference positions in order to establish whether the vehicle has passed one of the reference positions, wherein a reference position is defined by a capture line extending through the spatial coordinates of said reference position, wherein the processing device is configured to establish whether the vehicle has traversed a capture line and to assess an established traversing of the capture line as the vehicle passing the reference position defined by the capture line, having a traffic control centre assigned to a road network and configured as a supervisory control centre for vehicles configured as special vehicles, for the prioritization thereof at traffic signal-controlled nodes of the road network, - wherein reference positions are assigned to accesses to nodes, - wherein the terminal comprises a signalling device, which cooperates with the processing device and which is configured, after it has been established that the vehicle has passed a reference position, to output a message comprising the spatial coordinates, a passing time and an identification datum of the terminal, - wherein the terminal comprises a communication device for wireless transmission of output messages to the traffic control centre, wherein the capture line is defined by a reference travel direction for vehicles, said reference travel direction being assigned to the roadway at the reference position, and extends transversely with respect to said reference travel direction, wherein the position determining device is configured for determining the travel direction of the vehicle, and wherein the processing device is configured to compare a travel direction of the vehicle determined in the event of an established traversing of the capture line with stored reference travel directions, and - wherein the traffic control centre is configured for further processing of the messages. having a traffic control centre assigned to a road network and configured as a supervisory control centre for vehicles configured as special vehicles, for the prioritization thereof at traffic signal-controlled nodes of the road network, - wherein reference positions are assigned to accesses to nodes, - wherein the terminal comprises a signalling device, which cooperates with the processing device and which is configured, after it has been established that the vehicle has passed a reference position, to output a message comprising the spatial coordinates, a passing time and an identification datum of the terminal, - wherein the terminal comprises a communication device for wireless transmission of output messages to the traffic control centre, - wherein reference positions are assigned to accesses to nodes, - wherein the terminal comprises a signalling device, which cooperates with the processing device and which is configured, after it has been established that the vehicle has passed a reference position, to output a message comprising the spatial coordinates, a passing time and an identification datum of the terminal, - wherein the terminal comprises a communication device for wireless transmission of output messages to the traffic control centre, wherein the capture line is defined by a reference travel direction for vehicles, said reference travel direction being assigned to the roadway at the reference position, and extends transversely with respect to said reference travel direction, wherein the position determining device is configured for determining the travel direction of the vehicle, and wherein the processing device is configured to compare a travel direction of the vehicle determined in the event of an established traversing of the capture line with stored reference travel directions, and - wherein the traffic control centre is configured for further processing of the messages. - wherein the traffic control centre is configured for further processing of the messages.