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Arch Hill

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Arch Hill
Location Map ( geo)
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Highway Authority
Junction Type
Double Mini Roundabout Junction
Roads Joined
A39 A390
Junctions related to the A390

A double mini roundabout at the junction of the A39 and the A390. One of the directions (marked for St Austell at the junction), leads onto the Truro City Centre bypass and this creates a multiplex between the two roads, with the A39 turning left off the A390 after Truro. Arch Hill is the name of the road in the Falmouth direction.


Traffic lights were installed at the junction upon the completion of the first section of the Truro Relief Road from Arch Hill to Lemon Quay in 1968. However there were accidents at the junction and so another solution was sought.

Arch Hill was the first double mini-roundabout in the UK and was used by the Road Research Labs to make sure that this kind of junction could work. This lead onto the creation of the Magic Roundabouts of Swindon and Hemel Hempstead, as well as other places. It was installed in the week beginning 10 May 1971 and has remained virtually untouched since, although recent plans may change this.

Source: West Briton and Cornish Advertiser and


Route To Notes


Falmouth, Helston (A394)


Redruth (A30)


St Austell (A390), Bodmin (A30)
City Centre

Arch Hill
Other nearby junctions
Junctions on the A39
Bath to WellsGlobe • Two Headed Man  • White Cross  • Rush Hill Junction  • Bathway Crossroads  • Green Ore  • New Street Junction  • Burcott Road Junction  • Strawberry Way Roundabout
Wells to BridgwaterTin Bridge Roundabout  • Northload Bridge Roundabout  • Wirrall Park Roundabout  • Street Roundabout  • Westway Roundabout  • The Pipers  • Crandon Bridge • Dunball Interchange  • Cross Rifles Roundabout
Bridgwater to BarnstapleWhitegate Roundabout  • Sandford Corner  • Washford Cross  • Carhampton Cross  • Blackmoor Gate  • Ford Cross  • Mermaid Cross  • TA Roundabout  • Portmore Roundabout  • Lake Roundabout  • Roundswell Roundabout
Barnstaple to WadebridgeWestleigh Junction  • Heywood Road Roundabout  • Abbotsham Cross  • Clovelly Cross  • Baxworthy Corner  • Thorne Cross  • Wainhouse Corner
Wadebridge to FalmouthWinnard's Perch  • Trekenning Roundabout  • Halloon  • Highgate Hill Roundabout  • Carland Cross  • Arch Hill  • Trafalgar Roundabout • Carnon Gate Roundabout  • Treluswell Roundabout  • Treliever Roundabout  • Kernick Roundabout  • Hillhead Roundabout  • Ponsharden Roundabout

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