The article describes public transport co-modality for sustainable development of public transport system. New strategies are needed to make city public transport more efficient, more accessible and more sustainable. There are some concepts described in the article. The concepts are illustrated with practice examples – how it is possible to increase capacity of infrastructure and what is done jet in Riga city for public transport sustainable development. Key benefits from each concept are also described. A more efficient use of city space, allocated to transport improves overall performance of all the passenger transport system. The concept of aid – base graph approach for calculation of territory assign to the particular stop of public transport for cost optimization conditions is proposed in the article. Efficient planning and better use of infrastructure, as god as passenger-friendly interchanges and good traffic management, allocated to public transport, brings public transport system towards sustainability.