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Traffic flow has already been improved in the German autobahn network by guidance systems utilizing data collection and calculating forecasts. Some examples of this are the remote-controlled traffic signs in the autobahn network Rhein-Main, the congestion warning system on the Aichelherg, and the lane-controlling system of the Frankfurt-Cologne autobahn. An improvement of the prediction accuracy can be expected if the destinations of the vehicles are known. This is the basic idea of the interactive ALI system (guidance and information system for drivers). After indicating his destination, the driver receives individual information about how to reach the destination in the shortest and easiest way. By knowing the destination, the system can improve its prediction ability. At this time, such a system of approximately 100 km in length is being prepared on an autobahn network in the Ruhr area; it is being financially supported by the Federal Ministry of Research and Technology, the Federal Minister of Transport, and several participating authorities of Northrhein-Westfalia. At 83 cross sections all vehicles will he counted and data will be exchanged with the ALI vehicles. This enables one to receive automatic directional information for 32 autobahn exits. For testing purposes, 400 vehicles will he fitted with ALI units. After considering the current traffic situation, the central computer can arrive at a forecast for this partial stretch of the network. For example, if there is a threat of congestion, the computer can modify its program for directional information in the cross sections, thereby informing ALI vehicles as to traveling time, operating costs of the vehicles, as well as the danger of congestion, and the detour route. Large-scale testing began in mid-1979, accompanied by a series of tests. The effectiveness of the system, an analysis of cost-benefit, and the effect upon driver acceptance will he determined. The evaluation of the large-scale testing will he a- ailable by mid-1981. This project is being carried out by Blaupunkt-Werke, the consulting engineers Heusch/Boesefeldt, and the Voikswagenwerke A.G. It is supervised by the Technical Inspection Bureau (TÜV), Rheinland.