The purpose of this research project is to deal with European road users’ attitudes, perceptions, opinions, needs, experiences and expectations with respect to road transport and safety. It is based on a common representative survey to be conducted in each participating member state, and a shared analysis of the large data-base. The survey will address issues such as mobility experiences, perception of safety needs by different types of road users; opinions and experiences about speeding, impaired driving; attitudes towards motorcycle riders, pedestrians and other road users. The information will be useful for comparing the relative standing of member states on the issues examined. It will also aid assessing citizens’ acceptance of EU (and national) road transport and safety policies, the limitations or successes of existing safety measures, or support for new measures and policies. As such SARTRE 4 can be viewed as a building block of ERSO.