Publications for technically interested readers

Have you taken a look at our projects? You have had a conversation with us and would now like to read more details? Then this is the right page for you.

Technical Papers

  • Technical Paper 1
    C-ITS Service “Traffic Signal Priority” via ETSI G5 (CAM and SREM/SSEM)
    Cooperative Intelligent Transport Systems (C-ITSs) enable cities to provide completely new types of CITS services. This opens up enormous potential and facilitates safe, environmentally friendly and efficient traffic. This paper explains the C-ITS service “Traffic Signal Priority” (TSP) via ETSI-G5 (CAM and SREM/SSEM message) to prioritize public transport in combination with “Green Light Optimal Speed Advisory” (GLOSA) for approaching traffic lights energy-efficiently. Based on the description of TSP systems, the new possibilities via ETSI-G5 communication are examined. The distribution of the intelligence of traffic control in a centralized/decentralized or a hybrid approach is also discussed. The results of the research simulation study show that an intelligent combination of TSP and GLOSA leads to extended benefits for all road users. Finally, details of the initial implementations in the C-ITS Pilot cities Dresden and Hamburg are presented.
  • Technical Paper 2
    Dynamic adapted green light optimal speed advisory for buses considering waiting time at the closest bus stop to the intersection
    A large amount of present green light optimal speed advisory (GLOSA) systems are for private vehicles. However, as one of nonnegligible transportation modes, public transportation is worth more attention. Some GLOSAs just provide several driving models with fixed speeds and accelerations which is extremely difficult for human-drivers to obey strictly and adapt dynamically. Therefore, this paper proposes a GLOSA for buses (GLOSA-B) considering the waiting time at the closest bus stop to the target intersection. By means of V2X communication based on ITS-G5 (IEEE 802.11p), this GLOSA-B could provide a range of recommended speeds and update calculation every second. To validate the proposed algorithm, 20 groups of GLOSA and non-GLOSA buses are simulated. The results indicate that this GLOSA-B could avoid unnecessary stops significantly. Compared with non-GLOSA buses, the GLOSA buses save waiting time at the target intersection by 98.95%.
  • Technical Paper 3
    Ideas about the increase of confidence of ITS messages to achieve legally binding in future
    In discussions concerning Hamburg’s ITS projects, the question often appears of what is necessary to achieve legal binding (or a status of “valid data”) for ITS messages, especially for SPaT and MAP, and what are the consequences for traffic lights and road users. This paper describes the current (or former) situation and how it will change. Focus points are changes in the installed hardware and the rise of potential issues for security problems. We will discuss the needs of Hamburg’s ITS projects and the differences between a test and a live environment of a PKI, with focus on possible user groups and its use for the HEAT project. We will also look at the importance of monitoring systems and concepts of degradation.

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