Ham Barn Roundabout

Ham Barn Roundabout is a roundabout on the A3 in Hampshire. It is named after Ham Barn farm to the north of the roundabout, though it has been nicknamed "Ham Rolls" because of its unusual shape and the number of vehicles that have rolled over.

It is now the only non-grade separated junction on the A3, outside of London or the Portsmouth urban area. The layout was chosen because the Liphook Bypass, between here and Hindhead, was expected to be built as a single carriageway and design standards recommend that the transition from dual to single carriageway is made via a roundabout. Late in the day the decision was made to build the new road as a dual carriageway, but the junction layout wasn't changed.

The junction opened on 12 July 1992, along with the two bypasses. £110,000 was spent on safety improvements in 1996, following a number of collisions.

A full upgrade to the junction seems unlikely, but signalisation has been proposed. As the roundabout sees relatively few turning movements, it is not as congested as some may expect, but the effect of the braking can cause lengthy slow-downs on the A3 during peak hours. The concerns are more about safety; both with traffic on the A3 approaching the roundabout too fast, and traffic on the B3006 pulling out at inappropriate times.

Routes

Route	To	Notes
A3	London, Guildford, Farnham (A325)
A3	Petersfield, Portsmouth, Midhurst (A272)
B3006	Selbourne
B3006	Liss 1 1/2