The flyover near Shepherd's Bush (Westway) was formerly A40(M), but was downgraded to A40 in May 2000.

Originally used on a road from Hambrook to Downend. Now the A4174 and A4017.

Originally used on a road between Chippenham and Bristol. Became a portion of an extended A420 in 1935.

Used to run from Pershore to Great Malvern Downgraded in the 1960s, with the Pershore to Upton section becoming an extension of the A4104 and most of the reminder becoming the B4211. The westernmost section in Great Malvern itself remained Class I, becoming part of the A4532, but this was downgraded in the 2000s with the B4211 extended over it. Crossed River Severn on swingbridge (demolished 1940) in Upton-upon-Severn.

Next used from M4 J24 in Ringland, Newport to George Street Bridge. Became part of the A48 Southern Distributor Road in 2004 and the rest is now Corporation Road.

Originally used between Oaken and Nantwich. Renumbered to A41 from Oaken to Hinstock and A529 from there to Nantwich in 1935.

Another A479 runs along Empire Way, Wembley (North West of London); this was formerly B4565 until 2007.

Originally used between Shrewsbury and Cemmaes Road. Shrewsbury to Mallwyd became an extension of the A458 and the rest became part of a rerouted A4084 (now A470) in 1935.

May have been used in Cheltenham along the former route of the A46; number is not shown on maps but does appear in a DfT road list from around 2002. A 1972 OS map indicates that this version of the A4016 dates from the late 1960s or early 1970s, possibly before construction of the M5 through the town. The route through the town center is now unclassified, Lower Winchcombe Street returned to the A46, Upper Winchcombe Street is now part of the A435, and the remainder is now the B4632.

Originally ran from Beeches Green to Cairnscross. Became a portion of the A419 in 1935 when it was rerouted.

Originally ran along Park Road in Hagley; declassified when the A491 bypass was built.

Originally ran from Wall Heath to Kidderminster which became a portion of the A449 in 1935.

Originally ran from Crumlin to Brynmawr. Renumbered as a northern extension of the A467 in 1935.

Number later used for Victoria and Newmarket streets between the A438 and A49 in Hereford. Became the A438 and A49 due to pedestrianization in Hereford.

Also used in Newport linking the A48 to the docks near Watch House Parade. Later renumbered as an extension of the A4042 and has since been declassified; the completion of the A4042/A48 rendered the route redundant.

Originally ran across the southern side of Cardiff city center from the A48 to the A4055. Later renumbered as an extension of the A4055 and is now part of the A4160 after the A4055 was rerouted.

Number later used in the late 1970s for the Droitwich Spa bypass; became a portion of the A38 in the early 1980s.

Number later used between the A40 and A438 near Brecon as an upgrading of the B4557. Downgraded to the B4602 except for the southern end, which is unclassified.

Originally ran from Hirwaun to Brecon Beacons. Renumbered as an extension of the A4059 in 1935.

Used again in 1935 from A468 at Tredegar Park to A467 (now B4591) at Rogerstone after the B4242 and B4243 were upgraded to Class I status. The southern section became part of the A467 in 1983 and the remainder was declassified.

Used again in 1935, cutting the corner between the A438 and A479 in Llyswen and was the B4344 before it was upgraded to Class I status. Now part of the A470.

Originally ran between Narberth and Narberth Castle along High Street. When the A40 was rerouted in the late 1920s, the A4074 was downgraded to Class II status as the B4313, but is now part of the A478 one-way system.

Next used in 1935 from the A489 near Cemmaes to Mallwyd on an old section of the A491 (the remainder became the A458, which ironically replaced the original A4084). Became a portion of the A470 in the 1970s after it was extended.

Next used in 1935 from the A489 in Tremadog to the A499 in Llanwrda; this was originally the B4410 before it was upgraded to Class I status. Became a part of the A487 in the 1960s after it swapped numbers; the old route of the A487 is now the current A4085.

Originally ran from the A404 to the A416 in Amersham. Became a spur of the A404 in 1935 and is now part of the A4154.

The second A4108 ran from Gelilydan to Congl-y-wal, created around 1947 when the B4408 was upgraded to Class I status. Later became part of the A470 to create a north–south cross-country route through Wales.

Originally ran from Bladon Road to Oxford Road in Woodstock; this was part of the B4024 before it was upgraded in 1922 (the remainder was renumbered A4095). Became a spur of the A4095 in 1935 and was declassified by the 1950s.

Originally ran from Aberaeton to Lampeter; this was previously the B4340 before it was upgraded in the mid-1920s. Became part of a rerouted A482 in 1935.

First used between Stroud and Cirencester, designated in the mid-1920s when the B4069 was upgraded. Became part of a rerouted A419 in 1935.

Originally the southwestern portion of the Oxford Ring Road, from Botley to South Hinksey. Extended along the old A40 in the 1930s when it was moved to the Oxford northern bypass. The bypass was extended north around 1960, allowing the A34 to take over the southern extension of the A4141. The remainder later became the B4044.

Originally the northern section of the Gloucester Ring Road. Later switched to a section of leftover A40 in the center of Gloucester (the ring road was renumbered to A40); became a portion of the A417 by 1946 and is now unclassified and partially pedestrianized.

Number previously reserved in 1935 for upgrading the B489 to form a Swindon-East Anglia route with the A5160 (proposed to be used instead of the A505 for the A505/A601 route for number continuity). But the tonnage was not enough (and it was never going to be) to upgrade the road to Class I, so this proposal fell through and the route remains the B489.