To make the most of cities' growth potential, it is important to facilitate transport links among metropolitan areas and between metros and smaller urban centres. Governments may set targets for cities to fulfil different roles, (e.g. "Innovation Cities", "Enterprise Cities", "Eco-Towns") or increases linkages between metropolitan areas and smaller cities in a greater region (e.g. proposals for the Seine valley axis between Paris and Le Havre). Are cities' incentives aligned with the need to reduce the reliance on automobile transport?