Next used from the A303 at Stonehenge to the A360 at Airman's Corner. On 24 June 2013, the section from Stonehenge Bottom and Stonehenge was closed and grassed over. The remainder was downgraded to Class III as the C506.

It was also reserved in 1972 for the North Devon link road between Barnstaple and Bampton but that road was rerouted through Tiverton and opened as part of the A361 instead.

Originally ran from Halberton to Uffculme. Became a spur of the A373 in 1935 and is now declassified due to completion of the nearby M5 and A361. A small part east of M5 J27 is now part of the A38 as a "useless spur", as the A38 mainline was renumbered to B3181.

Number later used for a road linking Hilsea and Portsmouth. Became the northern carriageway of the A3 after the M275 was built.

Route later used for a loop off the eastern side of the A3017 in Portsmouth. Now the southern carriageway of the A3.

An older A3022 existed on the Isle of Wight until 1935 when it became part of an extended A3054. It ran between Newport and Ryde, terminating at the pier.

Originally ran on the Isle of Wight from Ryde to Sandown. Renumbered as an extension of the A3055 in 1935; the southernmost section is now the B3329.

Next used in Taunton town center along Upper High Street, connecting the A38 to itself. Because it performed so well in taking traffic out of the center of Taunton, it became a portion of a rerouted A38.

Next used along a former routing of the A33 in Reading. Downgraded to a B road with the same number.

Originally ran along Southbroom Place (now Southbroom Road) in Devizes, cutting the corner between the A342 and A360 and just missing the A361. Now a portion of the A360, although it may have been a spur before this.

Number possibly later used along Queen Street in Maidenhead; possibly a typo for the A3064 or it may have been changed later on for some reason.

Originally ran from the A358 in South Petherton to the A37 in Ilchester. Between 1927 and 1932 it was extended over the B3090 to the now-gone A344 near Stonehenge. Renumbered to the A303 in 1933; the A3036 number was reused as a renumbering of the original A303. See also: Albert Embankment

Later reserved around 1970 for "existing parallel length of A329 when passed by the S.E. Reading to N.W. Wokingham relief road", but the number was not used.

Next used as an unexplained renumbering of the A3043 in Plymouth. Now part of the B3396.

Originally ran from Salisbury to the A303 north of Cholderton; was the B3085. Became a portion of a rerouted A338 in 1935.

Next used as an upgrade of the B3021 from Old Windsor to Datchet. Renumbered as an extension of the A328 in 1935, but has since gotten its old number as it was downgraded back to the B3021.

Originally ran along the old A4 through Twyford. Renumbered as not one, but two spurs of the A321 in the 1935 renumbering; now the A3032.

Used a second time in 1937 as a temporary number for the northern section of the Exeter Bypass (renumbered from the A378), but it became the A38 in 1938 when it was rerouted (old A38 became the A3085).

Used a final time in 1975 between Redhills and Alphington on the western edge of Exeter. Declassified in the late 1970s when the A30 western bypass was built.

Originally allocated to the Guildford Bypass; renumbered to the A3 in 1934 when the remainder of the bypass was completed (the old route of the A3 became the current A3100). Now part of the A25 after a further A3 bypass was built.

Previously allocated to Wildcroft Road and Portsmouth Road in Putney Heath.