Thomas Sachse

A few practical problems on the application of OD-estimation in motorway networks

In the recent years OD-estimation has become an accepted tool for traffic analysis and control. There are many different OD-estimation models available each of them requiring a strict traffic and network database. In real road network one has to solve many practical problems such as location of detectors, missing of incorrect traffic data, variable route choice, the variability of the OD-matrix and the computing time in large networks. In this paper some results of analysing three different OD-estimators and testing them in a motorway network are presented. Furthermore some problems which arise when carrying out estimations are discussed.

Intelligent traffic control and optimization with cooperative systems on the eHighway: Using the electrified highway-infrastructure for heavy good vehicles and the advanced traffic control center with V2X for a more efficient and safer traffic (for all road users)

Making the traffic more efficient, safer and eco-friendly are important global aims for a sustainable future. To reach these goals electro mobility and V2X-communication are important key technologies. To reduce the emissions the automobile industry presented a quantity of electric car models during the last years. While the range of electric cars with about 150 km is adequate for inner city use, the battery-systems are not suitable for truck purpose. To enable electric driving also for long distance heavy goods vehicles (HGV) SIEMENS developed the eHighway technology. While using the overhead contact line it is possible to continuously provide electric energy to the vehicle and thus drive environmentally cleaner and more energy efficient. With the V2X-equipment of the eHighway and the connection to the traffic control centre (Conduct+) it is possible to increase the safety, the road capacity and to provide additional information for eHighway-user and all other V2X-equipped road users. While using the information from existing road sensors combined with the V2I-status-information of the road users, Conduct+ generates a holistic overview of traffic events. Via I2V Conduct+ advises the participants about changes in the traffic flow using in-vehicle signage. On a purpose-build test track SIEMENS and the DLR are proving the interaction of Conduct+, eHighway-infrastructure and V2X-equipped-eTrucks. This paper provides an insight into the eHighway-components and the functionality of the system components which enables the accumulation of traffic-data to enable an intelligent traffic control using V2X.