The campaign-challenge of Prof. George Yannis running 30 Marathons in 30 months for 30km/h speed limit in all cities has been well presented in scientific conferences (IRTAD, Energy Save, ITF) and workshops (organized by TUM and NTUA) and disseminated thanks to the active support of International Organisations (ETSC, ECTRI, UITP, ERF), NTUA, Polish Road Safety Observatory and Runner Magazine. As Luca Pascotto mentions: “George showed me that when you combine your work with your personal passions, your can set ambitious target and find new motivation, involved the people around you”, while Abel Coentrão highlights that “George will ally with everyone who wishes to make the voice of 30km/h Cities as strong as possible, as soon as possible”. Launching public awareness campaigns and encouraging the use of public transport and active mobility could be proved beneficial for the adoption of 30 km/h speed limits in cities. Promoting city-wide 30km/h speed limit at the Media is available: https://georgeruns30x30.com/media