Extended public transport operating data and bidirectional bus acceleration via WLAN The current priority of public transport in Aachen is achieved via analogue radio and fixed route points, which means that variable traffic conditions and construction sites are not sufficiently taken into account. In addition, drivers lack precise information on the optimal approach to traffic lights, which leads to unnecessary waiting times. A comprehensive quality analysis is also only possible to a limited extent due to incomplete operating data. The aim of the project is to achieve more efficient and flexible public transport priority through bidirectional WLAN communication. By providing drivers with traffic light switching times and speed profiles and collecting extended operating data, the attractiveness of public transport is increased. The data is also used for quality analyses and made available via a public platform. As part of the project, an existing test field in Aachen city centre is being technically upgraded. ASEAG test vehicles are being equipped with modern communication technology (802.11p / ETSI ITS G5), while a central server processes operating data and transmits relevant information to the Mobilithek. The data obtained are used to continuously optimize public transport priority.