The NRDC examined urban transportation in a new Smarter Cities study that identifies the 15 small, medium and large cities that are making eco-minded (and wallet-friendly) decisions to move their citizens around effectively. Beyond efficient city transportation infrastructure, Gordon provides a number of personal transportation tips that can make a major environmental difference. The NRDC examined urban transportation in a new Smarter Cities study that identifies the 15 small, medium and large cities that are making eco-minded (and wallet-friendly) decisions to move their citizens around effectively. Beyond efficient city transportation infrastructure, Gordon provides a number of personal transportation tips that can make a major environmental difference.