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Roundabout in Hemel Hempstead, Hertfordshire, England

"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, the M40 junction in Denham, and the Magic Roundabout in Colchester. The official name relates to a former public house, called The Plough Inn, which was between the junction of what is now Selden Hill and St Albans Road. It has also been known as the Moor End Roundabout as it is adjacent to the part of Boxmoor nearest the town. Before Hemel Hempstead became a new town the roads met in a simple junction which was then replaced by a standard roundabout.

Constructed in 1973, the "Magic Roundabout" in Hemel Hempstead was voted the UK's second worst roundabout in a 2005 poll held by an insurance company (the winner being its Swindon counterpart). The roundabout is unusual in that traffic flows both clockwise (the standard flow direction of British roundabouts) and anticlockwise. Drivers approaching the roundabout from any junction can choose to turn left or right, and they are free to make U turns using any of the mini roundabouts at the junction. Effectively, the junction should be treated as six individual roundabouts right of way must be given on the approach of each new mini roundabout.

The original magic roundabout had six exits in total, with the BP building spanning "Marlowes", the road leading to the town centre, in the approximate position of the earlier railway 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.