Some OECD countries, such as Canada and the United States, have traditionally restricted regulations on land use, prohibiting mixed land use to avoid the negative externalities of differences in land use. Such zoning still makes sense in many places, although land-use regulations should be better co-ordinated to increase access on foot to local services and jobs. Deregulating zoning and introducing form-based zoning can be a way to revive urban centres, as can establishing mixed-use zones that allow both business and residential uses. This helps to reduce travel time to jobs and services, and to improve access on foot or by public transit for older people.