The design and operation of public transport services is a complex topic – both from a planning perspective as well as from a mathematical and computer science point of view. For this reason, traffic planning is supported by optimization tools in order to improve the service, to reduce costs, and/or to improve working conditions. Application areas range from the design of the network infrastructure to the dispatching of specific resources design in every day operation and passenger information. Due to the steady increase of the mobility demand, such systems become more and more important. This seminar discusses current trends in traffic optimization.