With 2586km2, Luxembourg is the 7th European smallest country in Europe. Despite its small size this country is facing important mobility challenges. Out of the 380 000 available jobs in the country, nearly 43% of them are occupied by cross borders workers. These 165 000 cross borders traveling every day from France, Belgium and Germany generate an important pressure on the transport infrastructures. Because 89% of the cross-borders workers and 74% of the resident workers commute by car, the road system, at peak hours, reaches saturation. In order to decrease the pressure (in term of commuting flow, residential prices, etc.) on Luxembourg City and to reach a more balanced polycentric development across the country the development of Belval has been decided by the government. This new-town which is located 20km south-west of Luxembourg-City will attract economic activity and residential units. The University of Luxembourg will be one of institutions relocating most of its infrastructure in Belval. Without any doubts, this workplace relocation will greatly affect the University staff commuting mobility. In accordance to any public institution or large enterprise in this country, the University is more and more committed to reduce the carbon footprint related to the staff and students commuting behavior. The MODU (national sustainable mobility strategy) defines strong modal split objectives and the number of parking spaces available for the university on Belval site will rely on this national objective. So far, few scientific contributions analyzed the accessibility variation for car and Public Transport (PT) on important worker’s’ population considering relocation actions of this size. GIS tools and visualization techniques will permit to quantify the car and public transport accessibility vari ation due to the University move to Belval. The scientific contribution of this article lies in the relation between the car & PT accessibility and the development of Travel Demand Management (TDM) measures. Indeed, an ...