ConVoco, the Biogasmax partner leading the transfer of knowledge in Poland and new member states, have recently invited to Poland a group of international experts to talk with interested cities about today's challenges in the area of transport as part of sustainable urban development. The conference gathered representatives from fourteen countries, including high level officials from 20 cities from the new member states and from the neighbouring countries of the EU. The event was carried out under the auspices of Poland's Ministry of Economy and Ministry of Infrastructure, and with input from the European Commission.