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Running for 284 miles between London and Land's End, the A30 is the third longest A-road in Britain, yet for about half its length it is non-primary.

The A30 used to provide the most direct route from London to the southwest of England. Nowadays, much of the through traffic from the London area to south west England now uses the M3 motorway as far as Basingstoke then the A303 to Honiton where the route again joins the A30. As a result, most of the A30 has been downgraded and only parts of it now retain trunk road status.

The section between Honiton and Penzance, however remains vital to the economy of Cornwall as well as Central and Western Devon; this part of the route is an important trunk route, mostly grade separated dual carriageway. Places on the trunk section have been bypassed and sections of road widened.

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