These types of policies can be implemented to address externalities like noise and pollution intensity (including GHG emissions) associated with heavy6 cars and trucks. Zoning may influence the demand for transport volume, notably by reducing traffic by heavy cars in urban centres, which can in turn help to reduce GHG emissions per kilometre driven. Only recently, some metropolitan governments in Korea (for example, Daegu, Busan and Incheon) have introduced “Transit Mall Districts”, which are only accessible to public transit and bicycles.