Most of the A399 runs along the western section of Exmoor National Park.
South Molton - Ilfracombe
The A399 starts at a roundabout just north of South Molton with the A361 and heads northwards along the Bray Valley. The road has quite a few bends in it as it runs through woodland alongside the river. It crosses the river at Newtown Bridge and continues along the valley to Brayford.
From here, it leaves the woodland and climbs up through heathland, where there's a nice straight run along Bratton Down and then back down the other side past a reservoir towards Blackmoor Gate, where the A39 crosses at a staggered junction. All of this section was once the B3226.
The A399, meanwhile, leaves the heathland and winds its way down to Combe Martin, where it reaches the North Devon Coast. It continues along the coast running alongside several camping and caravan sites into the centre of Ilfracombe, where it meets the terminus of the A361 head on.