Île-de-France (2) Paris (2) Instruction and study (2) Differentiation (2) Development (2) Pruning (2) Travel (2) Costs (2) Brittleness (2) Law and legislation (2) Tourists (2) Assaying (2) City dwellers (2) Service-level agreements (2) Walking (2) Urban transportation (2) Travelers (2) Social integration (2) Smart cards (2) Service industries (2) Ridesharing (2) Penal transportation (2) Possibility (2) Politics, Practical (2) Political science (2) Necessity (Philosophy) (2) Local transit (2) Levers (2) Gait in humans (2) Fashion (2)