Urban sprawl
The extent of the practice around roads led to its problems becoming intense and recognition as an inefficient use of resources, requiring bypass roads to be built, and often a precursor to untrammelled urban sprawl, so a key aim for the United Kingdom's post-war planning system was to implement a presumption and convention that proposed new ribbon development is inappropriate. Urban sprawl/suburbanisation of large areas led to the introduction of green belt policies, new towns, planned suburbs and garden cities.