instructions on the use of the CycleStreets.net API. Thanks to Barry Rowlingson from the University of Lancaster for developing functionality in the stplanr package that enabled the creation of the Route Network layer. We are grateful to Matthew Tranter at DfT for merging additional geographic data into the UK National Travel Survey, and to Eva Heinen, Rick Prins and Thomas Götschi for their help in analysing Dutch and Swiss Travel Survey data. Thanks to Alvaro Ullrich for contributions to the code. Thanks to developers of open source software we have been able to make the PCT free and open to the world. We would also like to thank Brook Lyndhurst for assistance with the user testing, and all participants in the user testing sessions. We would also like to thank Shane Snow and other staff at the DfT for specifying the project’s aims and providing feedback on early versions of the tool. The work presented was funded by the Department for Transport (contract no. RM5019SO7766: “Provision of Research Programme into Cycling: Propensity to Cycle”), with contract facilitation and project management by Brook Lyndhurst in Phase 1, and by Atkins in Phase 2. RL’s contribution was supported by the Consumer Data Research Centre (ESRC grant number ES/L011891/1). JW’s contribution was supported by an MRC Population Health Scientist Fellowship. JW’s and AA’s contributions were supported by the Centre for Diet and Activity Research (CEDAR), a UKCRC Public Health Research Centre of Excellence funded by the British Heart Foundation, Cancer Research UK, Economic and Social Research Council, Medical Research Council, the National Institute for Health Research (NIHR), and the Wellcome Trust. AG’s contribution was supported by an NIHR post-doctoral fellowship. The views reported in this paper are those of the authors and do not necessarily represent those of the DfT, Brook Lyndhurst, Atkins the NIHR, the NHS or the Department for Health. 33 Funding