B roads are numbered routes in Great Britain of lesser importance than A roads. See the article Great Britain road numbering scheme for the rationale behind the numbers allocated.
B300 to B399 Road From To Notes B38 (defunct) A38 at Bournbrook A38 at Selly Oak Allocated to the former A38 at Selly Oak when the bypass opened in 2011. As all B roads are three or four digit, the B38 numbers were patched over as B384 in early 2012. B300 A3 at Borough High Street A23 at Westminster Bridge Road Road Names: Union Street, The Cut, Baylis Road B301 (defunct) A303 (now A3036) at Vauxhall A3 at Kennington Road Names: Miles Street, Fentiman Road. Miles Street closed at railway viaduct prior to 1989, and Fentiman Road declassified prior to 2007. B302 A3212 at Chelsea Embankment A3216 at Pimlico Via Chelsea Royal Hospital and National Army Museum. Road Name: Royal Hospital Road B303 A3 at Clapham Common B224 at Old Town, Clapham Original routing of the A3. Road Name: Clapham Common North Side
Originally used in Battersea from the A3 on the north side of Clapham Common to the A3205 and A3206. Now part of the A3220, and for some time it was part of the A205 before that. B304 A3218 at South Kensington tube station A3212 at Chelsea Embankment Road Names: Onslow Square, Sydney Place, Sydney Street, Oakley Street B305 A3205 at Wandsworth A3220 at Battersea Road Names: Lombard Road, Vicarage Crescent, Westbridge Road B306 A219 at Putney Bridge A205 at Barnes Common Road Names: Lower Richmond Road, Queen's Ride. Passes Marc Bolan memorial. B307 (defunct) A3 in Putney Heath A3210 in Putney Heath Declassified. Much of route now gone and just a footpath. B308 (defunct) Trafalgar Square, Central London Victoria Embankment, River Thames Now part of the A400, which is out-of-zone. B309 (defunct) Pall Mall and Regent Street, Westminster A4 at Piccadilly Now part of the A4 one-way system. B310 A3217 at Eaton Square Hyde Park Corner Road Names: Belgrave Place, Belgrave Square, Grosvenor Crescent Originally ran along the Thames Embankment between the A3217 King's Road in West Brompton and the Houses of Parliament. Became a portion of an extended A3212 by 1948; the section west of Battersea Bridge is now part of the A3220. B311 A325 at Camberley, Surrey A322 at Lightwater, Surrey
Originally ran from the A3214 Buckingham Palace Road to the A3214 at Sloane Square. Now part of an eastern extension of the A3217. B312 A3217 Lower Grosvenor Place A3217 Hobart Place Road Names: Beeston Place, Grosvenor Gardens. B313 A3216 Chelsea Bridge A3214 at Pimlico Road Name: Ebury Bridge Road B314 (defunct) A3128 Cromwell Place, Kensington A4 (now A315) Kensington High Street, Kensington The Cromwell Road section became part of a rerouted A4 in 1961 while the Warwick Gardens and Cromwell Crescent sections remained a B road (unknown if it was the B314 as the number would have been out-of-zone). Warwick Gardens is now part of the southbound A3220 and Cromwell Crescent is unclassified. B315 (defunct) A3217 King's Road, Chelsea A304 Fulham Road, Chelsea Gunter Grove; became a portion of the A205 in the 1930s and is now part of the A3220. B316 A315 at Kensington A3220 north of Earls Court Road Name: Earl's Court Road. Covers the short two-way northern part of this road. B317 A315 near Kensington Olympia railway station A308 at Walham Green Via West Kensington tube station. Road Names: North End Road, Harwood Road B318 A308 King's Road, Fulham A304 Fulham Road, Fulham Road Names: Harwood Road. Originally continued north of the A304 to the A3218; this section was upgraded to Class I status as the A3219; the section along Jerdan place is now mostly pedestrianized. B319 A4 at Brompton B310 at Belgrave Square Road Names: Beauchamp Place, Pont Street, Chesham PlaceB320unused B321 A307 at Richmond B353 at Richmond Hill Road Names: Hill Rise, Richmond Hill. One-way southbound (uphill) except for southern section. B322 A305 at Richmond B321 at Richmond Hill Road Names: Church Road, Friars Stile Road. Originally applied to Kings Road instead of Church Road. B323 A3214 at Buckingham Palace A3212 at Millbank Road Names: Buckingham Gate, Artillery Row, Greycoat Place, Horseferry Road B324 B323 at Greycoat Place A3214 at Pimlico Road Names: Rochester Row, Warwick Way, Ebury Bridge B325 A315 at Kensington Road A4 at Gloucester Road tube station Road Names: Palace Gate, Gloucester Road B326 A302 at Westminster Abbey, Westminster A202 at Pimlico Road Names: Great Smith Street, Marsham Street, Herrick Street, Bulinga Street, John Islip Street B327 A4 Haymarket A4 Regent Street Road Names: Charles II Street; likely out-of-zone as it lies within the A4.B328 - B340unused B341 (defunct) B3073 at Oakley A341 at Canford Magna Former portion of A341; now unclassified.B342 - B348unused B349 A3003 at Barnes B306 at Putney Common Road Names: Station Road, Mill Hill Road, Lower Richmond Road B350 A3003 at Barnes A306 at Hammersmith Bridge Road Name: Lonsdale Road B351 A3003 at Mortlake A308 at Norbiton In two parts, separated by Richmond Park. Road Names: Sheen Lane, Queens Road B352 A307 at Ham Ham Gate, entrance to Richmond Park. Road Name: Ham Gate Avenue B353 A307 at Kew A307 at Petersham Via Kew Gardens and North Sheen railway stations. Road Names: Kew Gardens Road, Sandycombe Road, Manor Road, Queens Road, Star and Garter Hill B354 (defunct) A305 Sheen Road in Richmond A305 Hill Street in Richmond Now part of the A305 and/or A307 one-way system. B355 (defunct) A3003 in Mortlake A307 in Richmond The easternmost section was upgraded to Class I status as the A3003 in the 1920s when it was rerouted to avoid the level crossing in Mortlake. The remainder became part of the A316 in the 1930s when the Chiswick Bridge was completed. B356 (defunct) B355 Lower Richmond Road, Mortlake A307 in Kew Became a portion of the A205 in the 1930s. B357 (defunct) Wood Street in Kingston upon Thames A307 north of Kingston upon Thames Road Names: Lower Ham Road and King's Road. Was closed off in the 1980s with the development of the site of the former Kingston Power Station, which it passed. A short section along Wood Street is now part of the A308 and the remainder was declassified. Part of the road is now a footpath, Skerne Walk. B358 A308 at Hampton Wick A314 at Hounslow Heath Road Names: Nelson Road, Hospital Bridge Road, Sixth Cross Road, South Road, Stanley Road, Queens Road, Sandy Lane, Park Road, Church Grove. Originally ran further south along Park Road in Hampton Wick to the A310; this is now unclassified and the B358 runs along Church Grove (former B359). The section from Hounslow Heath to Sudbury Grove is now part of the A3063 and A4127. B359 (defunct?) B358 at Hampton Wick A308 at Hampton Wick OS maps and signage show the route as the southern end of the B358, but A-Z maps show the route as B359, and Richmond-upon-Thames council's road list agrees with them. B360 A310 at Strawberry Hill A311 at Fulwell Road Names: Shacklegate Lane, Fulwell Road. Includes spur to A313 at Teddington named Church Road B361 A310 at Twickenham A314 at Hounslow Via Twickenham Rugby Stadium and Kneller Hall. Road Names: Whitton Road, Kneller Road, Hounslow Road, Whitton Road, Hanworth Terrace B362 (defunct) A314 Hanworth Road, Hounslow A315 Staines Road, Hounslow Half of route now pedestrianised; some maps show the southern half as a spur of the A314. B363 A310 at Isleworth A3005 at Lampton Road Names: Saint John's Road, Spring Grove Road. B364 A307 at Giggs Hill Green B3379 at Thames Ditton Via Thames Ditton railway station. Road Names: Giggshill Road, Watts Road, Station Road, Ember Court Road B365 A244 at Walton-on-Thames A245 at Cobham Road Names: Ashley Road, Seven Hills Road B366 (defunct) A3/M25 J10 at Wisley Interchange A245 Now a cul-de-sac only accessible from the A245. B367 A245 at West Byfleet A3 at Ripley B368 A247 at Send A3 at Sendmarsh B369 B3379 at East Molesey A3050, Apps Court Green, Walton-on-Thames Road Name: Walton Road B370 (defunct) A309 in East Moseley A317 in Weybridge The section from Walton-on-Thames to Weybridge was upgraded to the A3050 in the 1920s with the remainder of the route also upgraded to an extension of the A3050 later on. B371 (defunct) A317 in Weybridge B365 in Weybridge Now part of the A317/B365 roundabout. Number does appear in some local government documentation. B372 A317 near Weybridge B374 at Weybridge railway station Road Name: Saint George's Avenue B373 A317 at Weybridge B374 at Weybridge railway station Road Name: Hanger Hill B374 A317 at Weybridge A245 at Byfleet Via Weybridge railway station and Brooklands Museum. Road Names: Heath Road, Brooklands Road B375 A244 at Lower Halliford A320 at Chertsey Road Names: Russell Road, Renfree Way, Chertsey Road, Chertsey Bridge Road, Bridge Road, London Street, Windsor Street, Staines Lane, St Ann's Road. Crosses Thames by way of Chertsey Bridge. Formerly served Shepperton village centre and ran eastwards along Fordbridge Road, Thames Street, Lower Hampton Road and Lower Sunbury Road to join the A308 at Hampton. B376 A412 at Red Cow Roundabout, Upton, Slough A244 at Shepperton Road Names: Datchet Road, Slough Road, Horton Road, Welley Road, Windsor Road, Staines Road, Wraysbury Road, Bridge Street, Laleham Road, Staines Road, Shepperton Road, Laleham Road, Shepperton High Street, Green Lane B377 A244 at Lower Feltham B376 at Laleham Road Names: Ashford Road, Feltham Road, Fordbridge Road, Ashford Road B378 A3044 at Stanwell A308 at Ashford Common Via Ashford railway station. Road Names: Park Road, Town Lane, Stanwell Road, Church Road, Convent Road, School Road B379 (defunct)Sherwood 2012, p.2 (Sherwood, Philip. (2012) Around Heathrow Through Time. Amberley Publishing, ) A30 on the east edge of Staines A4, Harlington east of Three Magpies public house and west of Sipson Road turn-off. Remnant of north end is now the pub's car park entry. Ran north beside Staines Reservoirs, bore right into Stanwell, met the B378. Oaks Road in Stanwell is a remnant of its continuation (it is now part of the B378). Then as Oaks Road and Heathrow Road through Heathrow hamlet and farmland around. Closed in 1944 when construction on Heathrow Airport began, and for a time was used as airport internal roads, and was gradually destroyed or buried during airport construction work during the years after. The B379 was then rerouted around the western edge of the airport along Stanwellmoor Road from Stanwell to Longford, but due to the airport's importance, this was upgraded to the A3044 in the 1970s. The old route through Stanwell became an extension of the B378. B380 A245 near Woking A324 near Pirbright B381 B380 Vicarage Road in Woking A247 Kingfield Road in Woking Not signposted; essentially a spur of the B380. B382 A245 at West Byfleet A247 at Kingfield B383 A319 at Chobham, Surrey B3022 at Winkfield B384 A38 at Selly Oak, Birmingham A38 at Bournbrook Former A38 in Selly Oak, originally numbered B38.
Originally ran from Sheerwater to Horsell. Upgraded to Class I status as a western extension of the A245. B385 A318 at New Haw A245 at West Byfleet Road Name: Woodham Lane B386 A320 at Addlestone A30 at Windlesham B387 A317 in Chertsey B375 in Chertsey Road Names: Fordwater Road, Weir Road B388 A328 at Englefield Green A320 at Chertsey B389 A30 at Virginia Water B388 at Thorpe B390 A36 at Heytesbury A360 at Shrewton Formerly the western section of the A344B391A316 at HanworthA312 at Hanworth (The Mount)Formerly the southern section of the A314.B392 - B399unused
B3000 to B3099