Being secure – which can be seen as the opposite of insecurity – when using public transport can be seen as a central feeling in creating accessible public transport for all. Security covers most parts of the journey: how to get on the bus, if the train is on time, whether the surroundings are threatening and so on. This chapter looks more closely at how security has become a central matter for organisations in public transport, how it is framed by these organisations, how it is linked to accessibility and why this link needs to be problematised. The analysis is based on an ethnographic approach with interviews with people with various disabilities and with officials who work on accessibility in public transport authorities, as well as go-alongs and a supplementary analysis of documents and webpages. The analysis can be used to better understand the insecurity travellers may feel when using buses and trains.