A roads in Zone 3 of the Great Britain numbering scheme

List of A roads in zone 3 in Great Britain starting west of the A3 and south of the A4 (roads beginning with 3).

The numbering zones for A-roads in Great Britain

Single- and double-digit roads

Road	From	To	Length	Notes
A3	The Monument, London	Portsmouth	78 miles (126 km)	A large majority is a trunk road. Its southern parallel motorway is designated the A3(M).
A30	Hounslow, West London	Land's End	281 miles (452 km)	Replaced for 6 miles (9.7 km) between Popham and the Bullington interchange by the A303 trunk road southwest of Basingstoke. A trunk road west of Exeter. Previously went via A343, Salisbury Road (old A343), B3042 (old A303), A3057, London Road (old B3400), B3400, and city streets (old A33) between Lopcombe Hill and Basingstoke, but this was changed as part of a renumbering of roads in the area. Replaced for 5 miles by M5 (J29 - J31) near Exeter.
A31	Guildford	Bere Regis	68 miles (109 km)	Near the M3 its Romsey and Winchester portion is replaced by: • the J10 to J11, M3, Winchester • The A3090 from J11 to Ower in the New Forest District — a winding route covering 11 miles (18 km) in 16 miles (26 km).
A32	Gosport	Alton	29 miles (47 km)	All in Hampshire
A33	Winchester	Reading	39 miles (63 km)	Resumes in Southampton as various roads such as the arterial road alongside Southampton Dock.
A34	Winchester	Salford	157 miles (253 km)	Most of the section between Oxford and Solihull is arguably the A44 and the A3400 however its modern course ends northeast to join the M40 from which the northern part of the road can be accessed after one junction of the M42 motorway. A trunk road to Oxford and between Stafford and Stoke on Trent.
A35	Southampton	Honiton	98 miles (158 km)	Originally went southwest from Charmouth to Clyst St Mary along what is now the A3052.
A36	Southampton	Bath	62 miles (100 km)
A37	Dorchester	Bristol	60 miles (97 km)	Broken in two past the former Roman town of Ilchester by a bypass which is a small fraction of the A303
A38	Bodmin	Mansfield	292 miles (470 km)	Replaced by J27 to J31, M5 past Exeter. Replaced in Birmingham by a shorter parallel road into the city centre, the A38(M). A dual carriageway in South Devon, Staffordshire and Derbyshire. The longest 2-digit A road in the UK, at 292 miles.
A39	Newton Park near Bath	Falmouth	191 miles (307 km)

Triple-digit roads

Road	From	To	Notes
A300	Upper Thames Street, City of London	Newington Causeway, near Elephant & Castle	Southwark Bridge
A301	Aldwych	St George's Circus	Waterloo Bridge
A302	Hyde Park Corner, London	Elephant & Castle	In two parts. 1. The London Inner Ring Road at Grosvenor Place to the Victoria one way system. 2. Victoria Street, half of Parliament Square and then Bridge Street (Westminster Bridge), followed by part of Westminster Bridge Road (which replaced part of the A23) and finally St George's Road (one way (north-west)) past St George's Cathedral, Southwark).
A303	M3 J8 south of Basingstoke	A30, between Newcott and Rawridge	A303 was previously used for the road from County Hall, London to Wandsworth, which was renumbered to the new A3036 so that the number could be used on the current route which replaced the old A3036, the original A3079, and parts of other roads.
A304	Fulham	Fulham	The western part of the Fulham Road. Originally continued east via what is now the A308 and the A4 to the A4 (now the A315).
A305	East Sheen	Hanworth	The road used to continue west of the A312 to the A308 in Sunbury via what is now the A316.
A306	Hammersmith	Roehampton	Hammersmith Bridge closed to motor traffic from April 2019
A307	Kew	Cobham	The section between Kingston upon Thames and Cobham follows the course of the old A3, and is still mostly called Portsmouth Road.
A308	Brompton	Maidenhead	Exists in three sections, one from Brompton to Chelsea, the second from Chelsea to north of Putney Bridge, and the third from the Robin Hood junction at Kingston Vale to Maidenhead. The section from the A4 to the A3220 was originally part of the A304, and the section from the A3220 to A219 was originally part of the A3217. The section between Roehampton and Kingston upon Thames follows the course of the old A3.
A309	Twickenham	Hook, London	Runs in two sections, one in Twickenham and Teddington as a non primary road and a longer primary section from Hampton Court to Hook.
A310	Hampton Wick	Brentford	Runs from the Hampton Wick junction with the A308 at Kingston Bridge northwards via Teddington, Strawberry Hill, Twickenham and Isleworth to the junction with the A315 at Brentford.
A311	Hampton	Twickenham
A312	Hampton	Harrow	The road has been dubbed "The A three-one-queue" owing to frequent peak-hours' heavy congestion. Part of its course ran from Hatton to Harlington, London across where Heathrow Airport is instead of its present course past Cranford more directly to north-east Hayes and districts further north including Harrow. Its middle section is officially known as The Parkway^[1] The deleted section is now Faggs Road, Hatton Road (sections were lost under the airport), A437, Station Road, Coldharbour Lane, and Yeading Lane.
A313	Hampton Hill	Teddington
A314	Hanworth	Hounslow
A315	Knightsbridge	East Bedfont	Exists in two parts: one from Knightsbridge to the junction with the A4, North and South Circular Roads at Chiswick Roundabout, and the other from the north end of Kew Bridge to East Bedfont. The section in between is part of the South Circular Road
A316	Chiswick	Start of M3 motorway (Sunbury-on-Thames)
A317	Hersham	Chertsey
A318	Chertsey	Byfleet
A319	Lightwater	Chertsey
A320	Guildford	Staines upon Thames
A321	Henley	York Town near Camberley	The road used to continue south of the A30 to the A323 in Ash via what is now the B3411. Before that, the road went southeast from Frimley Green via the following renumbered roads: B3012 (to Pirbright), A324 (through Pirbright), B3012 (to Fox Corner), and A322 (to Guildford).
A322	Bracknell	Guildford
A323	Hartley Wintney	Guildford
A324	Woking	Normandy	Originally, the road continued west concurrent with the A323 and then southwest via the current B3208.
A325	Bagshot	Greatham
A326	Totton	Fawley	A326 was previously used for the road from Farnham to Petersfield (now part of the A325, with the southern portion now Petersfield Road, Farnham Road, B3006, and Farnham Road (the A3 was built over one section))
A327	Reading	Farnborough
A328	Old Windsor	Englefield Green
A329	Wentworth, Virginia Water	Thame
A330	Maidenhead	Sunningdale
A331	Camberley	Runfold	A331 was previously used for the road from Windsor to Ditton Park (now B470 and Ditton Road).
A332	Bagshot	Slough
A333	Hazel Grove (A3 Junction) near Grayshott	Hindhead	Renumbered when the Hindhead Tunnel opened in July 2011 having been formerly part of the A3. A333 was previously used for the road from Winchester to Cosham until 1994 when it was downgraded to B3335, B3354, and B2177.
A334	Wickham	Southampton
A335	Southampton	Near Eastleigh	This was intended to be the route for the M272. Formerly had a branch from the A335/B3335 junction to Twyford. This branch is now the B3335.
A336	Cadnam	Totton
A337	Near Cadnam	Christchurch
A338	Bournemouth	Besselsleigh	Originally went via what is now the B3087 and A345 from Burbage to Salisbury; this was changed during a road renumbering in the area.
A339	Alton	Newbury
A340	Basingstoke	Pangbourne
A341	Merley, (Poole)	Red Hill Roundabout, Red Hill, Bournemouth	A341 was previously used for the road from Winchester to Lopcombe Corner. The section west of Stockbridge became part of the A30 which was rerouted, while the remaining section became part of the A272 (now B3049) at the same time that the current A341 was created.
A342	Chippenham	Andover	Previously continued southeast to Winchester; this section was changed to the new A303 (now the B3402), an extension of the A3057 and the new B3420 (southern portion now part of the A272) as part of a renumbering due to the creation of the current A303.
A343	Newbury	Lopcombe Corner, Winterslow
A344	Unused		Ran from A360 to the Stonehenge visitor centre (became C506 in 2017). On 24 June 2013, the section the Stonehenge visitor centre to Stonehenge was closed to public traffic and the section from Stonehenge to the A303 was dug up and no longer exists. Previously, the road continued west to Heytesbury via what is now the A360 and B390. Before the A303 existed in the area, the road continued east via the current A303 to Andover.
A345	Marlborough	Salisbury	Formerly continued north via the current A346, A419, A4259, B4006, A4259, and B4311 to Swindon. Originally, the A345 went southeast from Marlborough via the current A346 to Ludgershall; this was changed in a road renumbering in the area.
A346	Ludgershall	M4 J15 southeast of Swindon	Follows A338 between Collingbourne Ducis and Burbage, then continues via Marlborough. A346 was previously used for the road from Collingbourne Ducis to the A303 south of Shipton Bellinger; this became part of the rerouted A338 in a road renumbering in the area, while the A346 number was reused on the old route of the A345.
A347	Ferndown	Bournemouth
A348	Trickett's Cross	Poole
A349	A31 in Wimborne	Poole
A350	Poole	M4 J17 north of Chippenham
A351	Lytchett Minster bypass	Swanage	via Corfe Castle
A352	Wareham bypass	Sherborne
A353	Weymouth	Warmwell
A354	Salisbury	Isle of Portland	Previously ran through town centres of Dorchester and Weymouth. Rerouted in Upwey along new alignment.
A355	Amersham	Windsor	A355 was previously used for the road from Sherborne to Blandford Forum (the western portion became part of an extended A352, the eastern portion became part of an extended A357, and the middle section was renumbered the A3030 to discourage through traffic)
A356	Bower Hinton	Grimstone
A357	A371, near Wincanton	Blandford Forum
A358	Williton	east of Colyford	Route passes through Taunton and Chard in Somerset. Between Taunton and Ilminster, it provides the main link between the A303 and the M5. Route previously went southeast from Ilminster via what is now the A303 and the A3088 to Yeovil; the route was changed south of Ilminster to the current routing as part of a renumbering due to the creation of the current A303.
A359	Yeovil	Nunney
A360	Devizes	Salisbury
A361	Ilfracombe	Kilsby	The section between Beckhampton and the A4289 in Swindon was renumbered the A4361 to discourage through traffic, and the section through Swindon is now A4289, Wood Street, B4289, Shrivenham Road, Stratton Road, and B4006. Through traffic should use the A4, A346, and A419 between Beckhampton and Swindon. At 195 miles (314 km) is the longest 3 digit A road in the UK. Before the North Devon link road opened, it went along unclassified roads to South Molton, and then northeast via what is now the B3227.
A362	Warminster	Farrington Gurney
A363	Bathford	Yarnbrook	Previously continued south to Warminster; this section became part of the A350.
A364	Unused		Previously a road between Yarnbrook and Chippenham. Now part of the A350. It was also proposed 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.
A365	Box	A361 near Seend	Via Atworth, Shaw, Melksham and Sells Green; originally joined the A350 through Melksham town centre but now both roads follow a western bypass.
A366	Trowbridge	Ammerdown crossroads (near Radstock)
A367	Bath	Shepton Mallet
A368	Marksbury	Churchill, Somerset	Formerly continued northeast to Bath, but this section became part of the A39.
A369	Portishead	Bristol	A369 was previously used for the road from Glastonbury to Marksbury (now part of the A39). Number reused later as an upgrade to the eastern half of the B3124.
A370	Bristol	Near Brent Knoll
A371	Wincanton	Weston-super-Mare
A372	Podimore, Yeovilton	Bridgwater
A373	Honiton	Cullompton	Formerly continued north to Uffculme concurrent with the M5 and west to Tiverton via what is now A361, this section became part of its current routes when the freeway extension west of Tiverton was completed. Before the freeway was built, the A373 went west from Honiton to South Molton via what is now the B3181 spur, B3181 (old A38), A38, A361, Lower Town, Turnpike, High Street, Post Hill, Blundell's Road, A396, A3126, and B3137. Earlier, the road was routed on what is now South View Road and Willand Road from Willand to Halberton, but this became part of the B3391, while the A373 was concurrent with the A38 north to Uffculme and west on the old A373 spur to Halberton as shown above. Earlier the road continued east to Charmouth via the current A35 (then the A35 went west via the current A3052). Originally, the A373 went west to Ilfracombe, but that section became part of an extended A361.
A374	Marsh Mills, Plymouth	Trerulefoot	Runs through Union Street, Plymouth. Originally followed the current A38 between these points (though one section became the B3413 when the A38 bypass was built), while the A38 followed the current route; these routings were swapped later, moving these routes to their current routes. A374 was previously used for the road from Donyatt to Colyford; this became part of the A358 as part of a renumbering due to creation of the current A303.
A375	Honiton	Sidmouth
A376	Exeter	Exmouth
A377	Exeter	Barnstaple
A378	Langport	Taunton	A378 was previously used for the road from A379 south of Exeter to the A38 (now A3015) in Pinhoe (became part of rerouted A38 (now the north spur of the A379), and the rest was declassified (became the B3182 shortly after that, now Old Rydon Lane), and the northern section became part of the B3181 (now Clyst Road, Sidmouth Road, and Moor Lane).
A379	Kennford	Plymouth	Formerly ran through St. Marychurch in Torquay passing coach station. Rerouted along Babbacombe Road (original B3199). Concurrent with A3022 between Torquay and Paignton. From 1991 to 1997, the sections of route between Dawlish and Torquay and through Goodrington were downgraded to B3199.
A380	Kennford	Torbay	Bypasses Kingskerswell on new South Devon Highway. Previously continued into Torquay town centre but rerouted along Torbay Ring Road (former A3022) to junction with A385 and A3022.
A381	Teignmouth	Salcombe
A382	Newton Abbot	East of Okehampton
A383	Newton Abbot	Bickington
A384	Dartington	Buckfastleigh	Originally Totnes to near Launceston via Two Bridges (eastern section now part of A385; western section now part of B3157 and B3162)
A385	A380/A3022 near Paignton	South Brent bypass	Previously continued along present A3022 into Paignton town centre. Previously followed what is now Plymouth Rd west of Totnes.
A386	Plymouth	Appledore
A387	Polbathic	Polperro
A388	Saltash bypass	Landcross
A389	Padstow	Lanivet
A390	Tavistock	Truro
A391	St Austell	Lanivet
A392	St. Columb Road	Newquay	A392 was previously used for the road from Truro to northeast of Redruth; this became part of an extended A390 (which was later rerouted north), and the A392 was reused on the current routing as an upgrade of part of the B3279.
A393	Redruth	Penryn bypass.
A394	Treliever Cross, Penryn	Longrock, Ludgvan
A395	Trewassa^[n 1]	Tregadillett^[n 2]
A396	Dunster	Cowley
A397	Portsmouth	Portsmouth	A397 was previously used for the road from Halberton to Uffculme (became a spur of the A373, now Turnpike, Lower Town, A361, and part of the A38).
A398	Unused		Previously a road between Taunton and South Molton (became part of the A361, now part of the B3227).
A399	South Molton bypass	Ilfracombe

Four-digit roads (30xx)

Road	From	To	Notes
A3000	Turnham Green	Chiswick
A3001	Unused		Ran from Ealing to Brentford (now B455).
A3002	Brentford	Hanwell
A3003	Mortlake	Barnes
A3004	Isleworth	St Margarets
A3005	Southall	Hounslow
A3006	Henleys Corner, Hounslow	Hounslow
A3007	Richmond	Richmond
A3008	Hampton	Hampton
A3009	Esher	Esher
A3010	Basingstoke	Basingstoke
A3011	Farnborough	A331	Section east of A331 now the B3166. Earlier, the road continued south to east of Ash (this became part of the A321, and is now part of the B3411).
A3012	Unused		Ran from A3011 (now B3166) in North Camp to A321 in Ash Vale (now B3165/Stratford Road).
A3013	Farnborough	Fleet	Previously allocated to a road from Frimley Green to Ash Vale (became part of the A321, and is now part of the B3411)
A3014	Unused		Ran from A321 (now B3411) to the A31 (now Oxenden Road) in Ash (now B3206 and Manor Road).
A3015	Sowton	Exeter
A3016	Hale	Hog Hatch
A3017	Unused		Ran from the center of Windsor to the A308 in Windsor Great Park. Probably decommissioned in 1935 when the A332 was rerouted along then-B3022. Downgraded when the A332 Windsor bypass was built, with part of the route becoming the B3022; the section along King's Road was declassified. Number later used for a road linking Hilsea and Portsmouth. Became the northern carriageway of the A3 after the M275 was built.
A3018	Unused		Connected the then-A332 (now A3095) to the A331 west of Crowthorne. Became a spur of the A3095 in 1935 after the A332 was rerouted; route later downgraded and is now an eastern extension of the B3348. Route later used for a loop off the eastern side of the A3017 in Portsmouth. Now the southern carriageway of the A3.
A3019	Unused		Original link to the Royal Dockyards in Portsmouth; now unclassified.
A3020	Cowes	Shanklin
A3021	East Cowes	Newport
A3022	A380, Kingskerswell	Brixham, Torbay	Previously ran entire length of Torbay Ring Road but rerouted into Torquay (former A380) and along former A379 between Torquay and Paignton. Concurrent with A379 between Torquay and Paignton. Section past Paignton Zoo formerly part of A385. 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.
A3023	Near Havant	Hayling Island
A3024	Southampton	Hedge End
A3025	Southampton	Netley
A3026	Ludgershall	North Tidworth
A3027	Staplegrove	Taunton
A3028	Durrington	A303 via Bulford
A3029	Bedminster	Hotwells
A3030	Sherborne	Lydlinch
A3031	Chelsea Embankment	Battersea Park
A3032	Hare Hatch	Charvil
A3033	Weston-super-Mare	Uphill	Originally the B3127, it previously terminated on the original A370 Locking Road. Although a bypass for the town centre, most traffic seeking to avoid the town centre uses the unclassified Winterstoke Road.
A3034	Unused		Ran along York Road between the A36 and A38 in Bristol (now A370). Initially thought to have become an eastern extension of the A370 in 1935, a mid-1960s map shows the route as still A3034 and the 1974 AA Touring Guide to England shows the road as A3024 (a typo), meaning the route may have had its number until the 1970s; it is now likely that the change was in 1935, but was later reversed as some large scale OS maps from the 1940s and 1950s show the road as A370. 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.
A3035	Southampton	Southampton Common
A3036	County Hall, London	Wandsworth	A3036 was previously used for the road from South Petherton to A344 (now destroyed) near Stonehenge, which became part of the new A303, while the number was reused as a renumbering of the old A303. See also: Albert Embankment
A3037	Unused		Ran from the A358 (later A303) to the A374 (now A358) in Ilminster. Declassified in 1988 due to completion of the Ilminster bypass and the declassification of the A303.
A3038	North Town, Taunton	Rowbarton, Taunton
A3039	Bath	Bath
A3040	Branksome	Wallisdown
A3041	Unused		Ran from the Devonport seafront to the A386. Decommissioned when the present A38 opened: the southernmost section is unclassified, the route through Stoke is now the B3396 and the section from Milehouse to Hartley is now a rerouted A386.
A3042	Unused		Ran from the A389 (later A38, now A374) in Devonport to the A387 (later A388, now A3064) in Keyham. Downgraded in the 1970s after the current A38 opened and is now the B3396.
A3043	Unused		Ran from the A3042 (now the B3396) in Devonport to the A3041 (also now the B3396) in Stoke. Renumbered to A3049 for reasons unknown.
A3044	Staines upon Thames	Harmondsworth
A3045	Unused		Loop off A390 in Lostwithiel. Decommissioned due to completion of the Lostwithiel bypass and is now part of the B3268. 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.
A3046	Woking	Chobham
A3047	Scorrier	Camborne
A3048	Unused		Ran along St Thomas Road connecting the A388 to the-then A30 on the west side of Launceston Castle and was later extended along the old A30 to the A30 southern bypass when it was built in the 1940s. Now just a spur of the A388.
A3049	Fleetsbridge	Boscombe	Number first used on a road cutting the corner between the A3 and the A27 near Portsmouth; was the first A3xxx number allocated after the original 1922 classification. Became a spur of the A27 in 1935 and later part of the A27 itself after the Cosham and Havant bypasses were built. The number was next used as an unexplained renumbering of the A3043 in Plymouth (now the B3396).
A3050	Weybridge	Hampton Court
A3051	Botley	Locks Heath
A3052	Charmouth	Clyst St Mary	Formerly part of the A35. A3052 was previously used for the road from Salisbury to A303 north of Cholderton (now part of the A338).
A3053	Unused		A3053 was previously used for the road between Bradford-on-Avon and Melksham in Wiltshire. It has since been downgraded to form part of the B3107.
A3054	Ryde	Totland	Northern part of Isle of Wight circular A-Class loop. Most of the Newport to Ryde section was the A3022 until 1935.
A3055	Ryde	Totland	Southern part of Isle of Wight circular A-Class loop
A3056	Newport	Sandown
A3057	Southampton	Andover
A3058	Mellanvrane	St Austell
A3059	St Columb Minor	St Columb Major
A3060	Red Hill Roundabout, Bournemouth	Iford, Dorset, Bournemouth
A3061	Unused		Ran between the A391 to a pier in St Austwell harbor; formerly the A390 and A3060.
A3062	Odd Down	Widcombe
A3063	Heston	Hanworth Road, Whitton
A3064	Milehouse	Weston Mill
A3065	Staplegrove	Bishop's Hull	Known as "Silk Mills Road"
A3066	Haselbury Plucknett	Bridport
A3067	Unused		Ran from the A36 to the A33 with a spur (former B3057) to the A3035, formed a portion of the South Coast Trunk Road (the T37) from 1946. Originally the A35 until it was renumbered to A3067 around 1940 for unknown reasons (probably to remove the multiplex with the A36) and became the A36 again when Tebourba Way was built in 1953.
A3068	Unused		Ran from Christchurch to Lymington (now part of the A337).
A3069	Unused		Ran from Lymington to Lyndhurst (now part of the A337).
A3070	Unused		Formerly connected A35 south-east of Axminster with Lyme Regis via Uplyme; now downgraded as southernmost section of the B3165.
A3071	Penzance	St Just in Penwith
A3072	Bickleigh	Bude
A3073	Stratton, Cornwall	Bude
A3074	Lelant	St Ives
A3075	Trevemper, Newquay	Chiverton Cross, Blackwater
A3076	Mitchell	Gunmows Shop, St Newlyn East
A3077	Unused		Ran from the A30 west of Penzance to the A30 at Trereife; formerly the B3314 from Penzance to Newlyn while the link to Trereife was the southern section of the B3316. The Penzance-Newlyn section is now unclassified while the remainder became a portion of the B3315.
A3078	Probus	St Mawes
A3079	Okehampton	Holsworthy	A3079 was previously used for the road from A30 northeast to Ilminster, which became part of the then-new A303 when that route was created
A3080	Unused		Ran along Bathwick Street in Bath, forming a shortcut between the A4 and A36. Now a spur of the A4 or A36, depending on direction of travel, although maps and the local council claim it as a spur of the A36.
A3081	Unused		Renumbering of the eastern half of the B3241 in Plymouth. Downgraded to the B3214, probably around the same time the A386 was rerouted.
A3082	St Blazey	Fowey
A3083	Helston	Lizard
A3084	Unused		First used in south Cornwall between Par and Holmbush along the westernmost section of the B3271 (much of which became the A3082 except for this section), but it became a portion of the A3082 anyway in 1935. 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.
A3085	Unused		Original routing of the A38 in Exeter before it was rerouted on top of the A3084. The northern section is now mostly the B3212 and much of the multiplex is now pedestrianized. The section from the River Exe to the northern edge of Alphington is now the A377, the route into Alphington itself is now the B3123 and the remainder unclassified. The southern end is now gone, lost under the A30 bypass.
A3086	Unused		Location unknown, but since the A3095 was created in 1935 this clearly did exist. This may have been a short-lived road from Andover to Micheldever (upgrade of the B3049; became part of the A303).
A3087	Firepool, Taunton	Rowbarton, Taunton	Also known as the NIDR (Northern Inner Distributor Road). Previously allocated to a road from the A36 (now Tollgate Road) via Rampart Road to the A30 (now Winchester Street) in Salisbury.
A3088	Yeovil	Stoke-sub-Hamdon
A3089	Unused		Location unknown, but since the A3095 was created in 1935 this clearly did exist. This may have been on the road that became part of the A303 as shown in the A3086 entry above.
A3090	Near Winchester	Near Totton	Formerly part of the A31. Before this, the A3090 was allocated to the road from the A31 through Winchester to the A33; this became the B3040 and an extension of the B3047, and the A3090 was reused on the current route.
A3091	Unused		Ran via Sussex Street and City Road from High Street (then the A272) to Hyde Street (then the A3090) in Winchester (now B3420 and B3330).
A3092	Unused		Ran on Eastgate Street, Union Street, North Walls from The Broadway (then the A31) to Hyde Street (then the A3090) in Winchester (now B3330).
A3093	Andover	Andover
A3094	Harnham	Quidhampton	Forms a southern ring-road around Salisbury
A3095	Sandhurst	Bracknell
A3098	Frome	Westbury

Four-digit roads (31xx and higher)

Road	From	To	Notes
A3100	Burpham	Milford	Formerly the A3 before the Guildford and Godalming 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.
A3102	Swindon	Melksham	Former A420 and B3102
A3110	Parting Carn, St Mary's	Parting Carn	Circular road on St Mary's island
A3111	Hugh Town	Parting Carn	The most westerly classified road in England
A3112	The Parade, Hugh Town, St Mary's	Parting Carn/St Mary's Airport	The most southerly classified road in the United Kingdom
A3113	M25 J14	Heathrow Airport
A3121	Wrangaton	Ermington	Formerly B3211
A3122	Halwell	Dartmouth	Formerly part of B3207
A3123	Combe Martin	Ilfracombe	Formerly part of B3343
A3124	Whiddon Down, Drewsteignton	Great Torrington	Formerly part of B3220 and unclassified roads
A3125	Barnstaple	Barnstaple	Formerly part of A39
A3126	Tiverton	Tiverton	Formerly part of A396
A3200	London Bridge	County Hall	Southwark Street/Stamford Street/York Road
A3201	A300 Southwark Bridge Road	The Borough	Marshalsea Road
A3202	Lambeth North station	The Borough
A3203	Lambeth Bridge	St George's Circus	Lambeth Road
A3204	Elephant & Castle	Vauxhall Cross	Kennington Lane, part of the London Inner Ring Road
A3205	Vauxhall	Battersea	In the London Borough of Lambeth: Nine Elms Lane; in the London Borough of Wandsworth: Nine Elms Lane, Battersea Park Road
A3206	Unused		Ran from A3205 to A3212 in Battersea. Became a portion of the A205 (now A3220).
A3207	York Road, Battersea	Lavender Hill, Battersea	Falcon Road
A3208	Unused		Ran on Wandsworth Bridge Road in Wandsworth from the A308 to the A3205. Now part of the A217.
A3209	Wandsworth	Putney Bridge
A3210	A240 in Surbiton	A243 in Surbiton	Short link road. Previously allocated to Wildcroft Road and Portsmouth Road in Putney Heath.
A3211	Westminster	Tower of London
A3212	Trafalgar Square	Chelsea	Whitehall, then Millbank and following the north of the Thames along the Chelsea Embankment to Battersea Bridge. The Houses Of Parliament are on this road.
A3213	Pimlico	Eaton Square	Previously allocated to a road in Pall Mall, London (now the A4). A 1926 MoT map shows the route as part of a rerouted A4, but a later OS 1951 map still shows the route as A3213.
A3214	Buckingham Palace	Royal Hospital Chelsea
A3215	A3214 in Buckingham Palace	A302 in Buckingham Palace
A3216	Knightsbridge	Clapham Common	In the City of Westminster: Sloane Street, Sloane Square, Chelsea Bridge Road, Chelsea Bridge; in the London Borough of Wandsworth: Chelsea Bridge, Queenstown Road (including Queen's Circus); in the London Borough of Lambeth: Queenstown Road, Cedars Road
A3217	Victoria	Chelsea
A3218	South Kensington	Fulham	Old Brompton Road, Lillie Road
A3219	Fulham	Fulham	Dawes Road
A3220	Clapham Common	White City
A3221	Unused		Ran along Fairfield Street between the A3205 and the A3 in Wandsworth. Now part of the A3, although it is labeled as the A217 on some maps.
A3259	Staplegrove	Monkton Heathfield	Formerly part of the A361.
A3280			Listed in the 2005 DfT road list as connecting the A259 and A27 in West Sussex. Possibly a typo for the A280.
A3290	Winnersh	Reading	Former western section of the A329(M).
A3393	Unused		Ran from A36 (now Fishoerton Street) in Salisbury along the Salisbury ring road northeast to the A30 as an upgrade of the B3393. Now part of a rerouted A36.
A3400	Hockley Heath	Near Chipping Norton	Out-of-zone as it runs in Zone 4, but intentionally chosen as a reminder of the former A34 designation.
A3604	Bath	Bath
A3611	Reserved		Reserved for a road in Trowbridge from 2006.
A3807	A38 in Taunton	A3027 in Taunton
A3822	A38 in Plymouth	A386 in Plymouth	Part of the new Forder Valley West link road.
A3860	A386 in Plymouth	Tamar Science Park	Shown on OS maps from 2019, but is unsigned nor does it appear on internet maps. Initially thought to be a copyright trap or a typo, but Plymouth Council has confirmed that the route does indeed exist.

Notes and references

 

Wikimedia Commons has media related to A roads in Zone 3 of the Great Britain numbering scheme.

Notes

1. northeast of Camelford
2. west of Launceston

References

1. See File:OS_Heathrow_5th_Edition.jpg