 One of the topics that Abercrombie's two plans had examined was London's traffic congestion, and The County of London Plan proposed a series of ring roads labelled A to E to help remove traffic from the central area.Even in a war-ravaged city with large areas requiring reconstruction, the building of the two innermost rings, A and B, would have involved considerable demolition and upheaval.The cost of the construction works needed to upgrade the existing London streets and roads to dual carriageway or motorway standards was considered significant; the A ring would have displaced 5,300 families.