B roads in Zone 3 of the Great Britain numbering scheme

Originally ran from A3214 Buckingham Palace Road to the A3214 at Sloane Square (now part of the A3217).

Originally ran from the A325 west of Aldershot, paralleling the Basingstoke Canal, to the A287 north of Crondall.

Due to its importance (Bournemouth was growing and the road served newly built suburbs), it was upgraded to an A-road with the same number around 1960.

Upgraded to Class I status as a portion of the A35 one-way system; now unclassified due to completion of the A338 Wessex Way.

Originally ran in Blandford Forum from the B3082 East Street to the A350 Miltdown Road.

Originally ran from St Thomas's Bridge in Salisbury to the-then A344 (now A303) at Parkhouse Corner.

The section along Hill Street became part of a rerouted B3106 and the remainder declassified in 1936.

Originally ran from the B3105 in Staverton (near the bridge over the River Avon) to the-then B3104 (later A3053, now B3107) on the western edge of Holt.

Original 1922 route described as 'Link at Norton Malreward (Northern Branch)', although the road was actually in Belluton.

Originally ran west of Brandon Hill Park in Bristol, linking the B3122 (later A36, now A4) to the A4018.

Renumbered as part of an extended B3139 in 1935, then upgraded to Class I status as the A371 or A39 in the late 1950s or early 1960s, and is now unclassified.

Renumbered as a spur of an extended B3139 in 1935, then upgraded to Class I status as the A371 or A39 in the late 1950s or early 1960s, and is now unclassified.

Also used in Surrey along Stratford Road from North Camp to Ash Vale (former A3012).

Originally ran from Topsham to Clyst St Mary; extended over the A378 to Pinhoe in 1935 after the northern section of the Exeter bypass was built.

First used between Countess Wear and Sandy Park when the previously downgraded A378 was upgraded back to Class II status between 1935 and 1948.

Originally ran from the A38 south of Broadclyst to the A30 in Clyst Honiton; this became an extension of the nearby B3185 but is now unclassified.

Prior to improvements to the A380 in Haldon Forrest carried out in the 1990s, the B3192 continued along what is now the southbound A380 to a junction at Thorns Cross Farm.

First used from Totnes to Buckfastleigh; this was upgraded to an extension of the A384 by the end of the 1920s (one section is now part of the A385).

Next used from Dartmouth to Stoke Fleming; became a spur of the B3207 in 1935 and then part of the A379 mainline after World War II.

Originally ran from the A373 (later A361, now bypassed) in South Molton to the A377; renumbered as a southern extension of the B3226 in 1935.

Originally ran from Bideford to Appledore; much of route became part of the A386 by 1927 and the remainder renumbered to B3236, although the A386 was later extended over this section as well.

Originally ran on the Rame Peninsula, from the A389 (now A374) in Antony to the B3247 near Tregantle Fort; renumbered as a spur of the B3247 in 1935.

Originally ran from the B3253 (now A387) at Sandplace to the A389 west of Polbathic; renumbered as a western extension of the A387 by 1930.

The final section into Polperro is now unclassified as the streets are too narrow for a Class I road.

Due to its importance, it was upgraded to Class I status early on, becoming part of the A389 by 1932.

The section from Newtown Crossroads to Fowey has since been downgraded to the B3415, although it no longer reaches the Town Quay.

Much of the route was upgraded to Class I status as the A3075 by the 1930s with the northernmost section in Newquay bypassed and declassified, although the northern end became a short extension of the B3282.

Originally ran from Freshwater to Sandown on the southern part of the Isle of Wight; much of route now the A3055 with the inland section now the B3399.

Originally ran from Rushall to North Newton; upgraded to Class I status as a spur of the A345 in 1935, then declassified in the 1960s.

Originally ran from Boreham to Sutton Veny; became a spur of the B3095 in 1935 and has since been declassified, probably because it was too close to the Warminster bypass.