This document outlines the value of an open data hub for mobility data. It discusses how making mobility sector data available through standard interfaces in an open data format can benefit various stakeholders. Standards like NeTEx, OJP and SIRI are highlighted as important steps for sharing planned, real-time service and real-time traffic data. Examples of existing open data hubs like ODIN and DELFI are provided. The document argues that open data is key to enabling smart mobility solutions and finding new opportunities on a global level.