The 31st ICTCT conference will be held in Porto, Portugal on 25-26th October 2018, under the main topic “On the track of future urban mobility: safety, human factors and technology”. The conference will be organised in close co-operation with the Research Centre for Territory, Transports and Environment, Faculty of Engineering, University of Porto, Portugal. The objective of the conference is to support the understanding of future trends in urban mobility and their implications for the safety of all road users.