It is planned to include for 2019 a topic addressing specific challenges of sustainable urban accessibility and connectivity. The topic will be further defined with the update of the work programme 2019. It is planned to implement the action as ERA-NET Cofund action. Proposals should pool the necessary financial resources from the participating national (or regional) research programs with a view to implementing a joint call for proposals resulting in grants to third parties with EU co-funding in this area. Proposers will be requested to include other joint activities including additional joint calls without EU co-funding.