The World Health Organization (WHO) with the contribution of NTUA released the Manual on Road Traffic Injury Data Collection Systems, which emphasizes on the way to collect road safety data in each country in order to be useful for informing road safety practice. Reliable and accurate data are also needed to correctly identify problems, risk factors and priority areas, and to formulate strategy, set targets and monitor performance. Ongoing, data-led diagnosis and management of the leading road traffic injury problems enables appropriate action and resource allocation.