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Closure of the A344 page 3

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Daily flows on the roads network near Stonehenge with A344/A303 junction closed and improvements at Longbarrow Crossroads © Highways Agency

Improvements at Longbarrow Crossroads

The effects of closing the A344/A303 junction could be mitigated by small-scale improvements at Longbarrow Crossroads to increase the capacity of the roundabout junction. This would be most effective at reducing congestion at peak hours, with the following effects: ²

• Generally reduced queue lengths on the roundabout approaches at peak times.

• The reduced congestion would attract more traffic back to the A360 southbound. This would most likely be as a result of traffic diverting from the A36/A303, reducing the flow on the A303 west through Winterbourne Stoke.

• There would be small reductions in traffic flow on The Packway in the morning peak but the improvements would make little difference outside peak hours.

The effects of the proposed improvements at Longbarrow Crossroads on the road network near Stonehenge, with the A344/A303 junction closed, are shown above.

The extra capacity at Longbarrow Crossroads could be achieved through additional approach lanes on the A303 westbound entry to the roundabout and on the A360 southbound entry, along with increased circulatory width of carriageway around the roundabout. Such improvements could be achieved within the existing highway boundaries.

² See HA report: A303 Stonehenge Improvement Scheme Review Partial Solutions Options Analysis
February 2008. (www.highways.gov.uk/stonehenge)

Longbarrow Crossroads © Highways Agency

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