Brussels-Capital Region has about 1 million inhabitants spread over 161 km². It is also the largest urban area in Belgium, comprising 19 municipalities, including the municipality of the City of Brussels. The actual urban conurbation spreads beyond the limits of the administrative entity, over a part of the Flemish and Walloon Regions, with a population of over 1.8 million.
Brussels' plans for urban mobility are encapsulated in the IRIS2 Mobility Plan which promotes a series of measures to promote modal shift in order to meet the targeted 20% reduction in road traffic by 2018. The Brussels-Capital Region has also committed itself to reduce emissions by 20% by 2015 compared to the 1999 level. This will require a strong modal shift from car to public transport throughout the Region in the order of 50%. Currently, more than a half a million trips occur daily in the Region during rush hour, of which 60% are by car. The development and improvement of intermodal transport and diversification of transport modes are considered essential to meet growing mobility demand. Through CityMobil, Brussels will evaluate the potential of such an innovative system and consider which accompanying measures (such as policies to restrict the use of cars, parking pricing, road pricing etc) will be necessary in order to have a real benefit in terms of modal shift and a drop in car-ownership.