Using this information, the number of vehicles that take a certain turn at each junction can be inferred. By instantiating this information in a faster than real-time simulator, predictions on actual traffic can be made. A system installed in Duisburg uses information from the existing traffic control center and produces real-time information on the Internet. Another system was installed on the freeway system of North Rhine-Westphalia, using data from about 2.500 inductive loops to predict traffic on 6000 km of roads.