In France, a total of 1,500 km (930 miles) of new dedicated-corridor public transport lines are planned for the next 10 years as part of proposals drawn up by the "Urban and Periurban Transport" operational committee of the Grenelle de l’Environnement, the French government’s environmental round table (October 2007). However, the issue of financing for public transport projects – which currently comes from public funds (State and local authorities), employer contributions (via the Versement Transport, or Transport Tax) and fare revenues from transport networks themselves – is one that is being examined increasingly closely by everyone in the transport sector. In a context where financial resources are becoming ever scarcer, there is clearly a need to reduce operating costs and optimise existing funds. The optimisation of funds is, moreover, one of the determining factors behind networks’ fare policies, which must also fulfil certain social requirements (ensuring the right to transport, providing reduced fares or even free travel for certain user categories, etc.). Furthermore, new sources of funding must also be sought : it is in this context that the general issue of transport fares is being studied, in particular the question of urban tolls.