A city can plan to make transport more sustainable. This includes:
Discouraging the use of private transport. In London this is achieved by a congestion charge for vehicles driving through certain areas.
Investing in public transport - improving the efficiency and safety of buses and trains.
Encouraging the use of bicycles. Bristol was the UK's first cycling city. It encourages the use of bikes by having bike festivals, investing in cycle lanes and supporting projects which promote cycling.
Promoting car sharing schemes for areas poorly served by public transport.