Magic Roundabout (Hemel Hempstead) viaduct. The BP building was found to be unstable due to defective reinforced concrete and the exit had to be closed. The building was demolished but the original route was not restored, although a newer side exit from the roundabout replaced the junction with Marlowes off a side road. Magic Roundabout (Hemel Hempstead) The "Magic Roundabout" in Hemel Hempstead, Hertfordshire, England, is the familiar name given to the Plough roundabout. The familiar name comes from the children's television programme, and is also used for a similar junction in Swindon and the M40 junction in Denham. The official name relates to
Britannia Roundabout the roundabout, splitting it into two smaller roundabouts. The project cost was estimated at $3.2 million, and involved the removal of a small number of trees from the nearby parkland. In April 2014, the new and upgraded "Britannia Roundabouts" came into operation. Britannia Roundabout The Britannia Roundabout is a roundabout intersection on the eastern side of the City Ring Route near the city centre of Adelaide. Before it was upgraded in 2014, many minor accidents had occurred over the years at this former traffic black spot. The five roads which join the intersection in clockwise order are Fullarton Road (to