Extended Fundamental Diagrams

By using a large data-base of single vehicle data from a German freeway, the Fundamental Diagram (FD) can be extended. These types of data allow to extract additional information that can be displayed as function of traffic flow Q and speed V. This is demonstrated here with a safety surrogate measure (SSM) and two other indices, which can be used to do more in-depth analyses of traffic flow. In case of the SSM, it is possible to identify more and less dangerous regions in the extended FD.