The
A4400 (or
Inner Ring Road or
Queensway) was a main road in
Birmingham,
United Kingdom that previously formed a ring around the city centre. Junctions on the road were largely
grade separated, with pedestrians kept physically separate from vehicular traffic and most junctions allowing vehicles staying on the road to pass over or under those using the junction. It is now widely regarded as one of the classic
urban planning blunders of the 20th century.