The B380 ranges from a country lane to a village high street in its roving through central Surrey.
It begins in Kingfield, with the A247 at a mini roundabout, before heading east then south through Westfield. Blink and you'll miss the B381, a.k.a. Loop Road, on the left.
We then reach a roundabout at the end of Westfield with a minor road (the former A320) and then onto a much bigger roundabout with the real one. The A320 always seems wide enough south of here for an additional carriageway to be built, but a combination of locals and low priority has always stopped upgrading.
We then travel across Smart's Heath, encountering a couple of unclassified roads, until we meet the A322 at Fox Corner. Here we have a rather nasty T-Junction with it and multiplex with it for a bit. Previously, the B380 travelled straight across here instead, but the A322 is a rather busy road and anyone who is infuriated with its crossroads with the A324 further north will realise why we are reduced to a three way junction.
A couple of dozen yards further south we leave the A322 and travel west along the former A321. However, rather soon we reach a TOTSO with the B3032 (which continues the former A321), which takes off a lot of the traffic (it's also quite disappointing to see that, after being signposted for Pirbright for the whole Westbound route, we never actually make it there). From here the road heads through woods until our final end, a T-Junction with the A324.