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.
Zone 1 (3 digits) Road From To Notes Length B100 Appold Street, near A501 Moorgate, London A1 Barbican Underground station, London Beech Street, Chiswell Street, Sun StreetSun Street is one-way westbound. B101 A5201 Old Street, London A1200 East Road, London Pitfield Street, New North Road. Partly one-way northbound. Partly cycles only. B102 A1200 New North Road, London A104 Balls Pond Road, London Southgate RoadOriginally ran along Bridport Place (now a path through Shoreditch Park). B103 (defunct) A1201 St. Paul's Road, London A104 Balls Pond Road, London Became a portion of the A1199 after the 1960s. B104 A105 Newington Green, London A10 in Stoke Newington, London Albion Road, Stoke Newington Church Street B105 A1201 in Finsbury Park near London A10 in Stoke Newington near London Brownswood Road, Lordship Park, Manor Road B106 B550 in Muswell Hill near London A406 in Bowes Park near London Original route ran from the A553 to the A10/A107 in Stamford Hill; this was upgraded to a portion of the A107 early on. B107 (defunct) A1203 in East Smithfield A1204, west end of Wapping High Street Thomas More Street. Declassified. B108 A1203 in Shadwell, London A104 junction in Dalston Queensbridge Road, Warner Place, Squirries Street, Vallance Road, New Road and Cannon Street Road B109 A118 Forest Gate A124 East Ham Original route ran from A107 to A104 in Hackney; this became a portion of the A107 when Mare Street was downgraded in the center of Hackney. B110 (defunct) A104 in Hackney A107 in Hackney Became a portion of the A107 when Mare Street was downgraded in the center of Hackney. A1 in Holloway A103/A503 in Holloway Essentially an extension of the B516, which was on the other side of the A1; now a part of the A107. B111 A10, Stoke Newington, London A107, Upper Claptonnear rail station Northwold Road B112 A102 Homerton A12 near Hackney Wick Marsh Hill, Homerton Road B113 A107 Hackney Central A106 Homerton Number also appears on maps on a section of downgraded A629 north of Sheffield; this is an error as the actual number is B6546. B114 (defunct) B112 in Homerton B118 in Old Ford Section south of the B113 was upgraded to Class I status, possibly as the A102, by 1939; the northern half gained that number much later. The northern half was upgraded again to A102(M) in the 1970s, but was downgraded in the 2000s and is now the A12. B115 (defunct) A107 in South Hackney A11 in Leytonstone Upgraded to Class I status in 1924 to bypass the A11 through Leytonstone and Stratford; the section west of the A112 became the A106 with the remainder gaining that number much later. Due to the A12, much of the original route was rerouted; the old route across the rail line is now severed and Church Lane declassified. B116 (defunct) B114 in Cadogan Gate B113 Chapman Road Later absorbed into the A115; much of route obliterated by the A12. B117 (defunct) B115 (now A106) South Hackney A11 Mile End Upgraded to a portion of the A1205 in the 1970s. B118 B142 near Bow A1208 Shoreditch, London Columbia Road, Gosset Street, Old Bethnal Green Road, Old Ford Road B119 A107 Bethnal Green, London A12 near Bow, London Roman Road B120 B119 Bethnal Green A11 Stepney Green Globe Road B121 A11 near Stepney Green, London A13 Limehouse, London Stepney Green, Stepney High Street, Belgrave Street B122 A10 Shoreditch High Street A1209 Bethnal Green Road Original route ran from the A11 to the A13 in Poplar; this was upgraded to Class I status in the 1930s, possibly as the A102, and was upgraded again to the A102(M) in the 1970s when the East Cross Route was built. Part of the original B122 still exists along St Leonards Street in Bow, but much of the route is now gone due to the motorway construction. The route is now part of the A12 when the motorway was downgraded in 2000. B123 (defunct) A1205 in Poplar B124 in Poplar Declassified due to the A1261, which bypassed the route to the south. B124 (defunct) A13 in Poplar A1206 in Millwall Became an extension of the A1206. B125 A12 near Bow, London A13 near Canning Town Abbott Road B126 A13 Limehouse, London A1202 (Dock Street) near Tower Gateway DLR station Cable Street B127 A107 Cambridge Heath railway station B118 near Bethnal Green Bishops Way, Stewardstone Road B128 (defunct) Moorgate, London Aldersgate Street, London Declassified. B129 (defunct) Moorgate, London Beech Street, London Declassified. B130 (defunct) Threadneedle Street, London Liverpool Street, London Declassified. B131 (defunct) A3 in London A1212/A1213 in London Declassified. B132 (defunct) A100 at Tower Hill, London A3211 in London Upgraded in the 1970s and renumbered as an extension of the A3211 in the 1990s. B133 (defunct) B132 (now A3211) in London B132 (now A3211) in London Declassified. B134 A1211 Aldgate, London A1209 near Shoreditch Alie Street, Osborn Street, Brick Lane B135 A1209 Bethnal Green Road A107 Cambridge Heath Road Sclater Street, Cheshire Street, Dunbridge Street, Three Colts Lane B137 A1010 Ponders End, London A1055 near Angel Road railway station Montagu Road, Nightingale Road B138 B151 Wood Green, London B150 near Harringay railway station Wightman Road, Alroy Road B140 B121 Stepney, London A12 near Bow, London Devas Street, Devons Road, St Pauls Way, Rhodeswell Road, Ben Jonson Road B141 (defunct) A109 in London A109 in London Declassified. B142 A11 Bow, London B118 near Bow, London Fairfield Road, Tredegar Road, Parnell Road B144 B100 Moorgate, London A1200 near Shoreditch Park, London Eagle Wharf Road, Shepherdess Walk, Bath Street, Bunhill Row. B145 (defunct) A13 in London A102 in London St Leonards Road, London B146 A110 near Chingford, London A1009 near Woodford, London Friday Hill B147unused B148 A127 Dunton Wayletts A176 in Basildon West Mayne, St Nicholas Lane B149 A1013 near Little Thurrock A126 near Chadwell St Mary Wood View, Chadwell Bypass B150 A1201 near Finsbury Park, London A105 near Seven Sisters, London Woodstock Road, Florence Road, Upper Tollington Park, Endymion Road B151 A109 near Wood Green, London B138 near Wood Green, London Hornsey Park Road, Mayes Road, Station Road, Park Avenue B152 A105 in Harringay, London A10 near Stamford Hill, London St Ann's Road B153 A504 in West Green, London A10 near Seven Sisters, London Philip Lane B154 A105 near Winchmore Hill, London A1010 in Edmonton, London Church Road B155 A109 between Wood Green, London and Tottenham, London A504 in Seven Sisters, London Belmont Road, Downhills Way B155 (defunct) A110 in East Barnet A1005 south of Potters Bar Upgraded to an extension of the A111 by 1926. The original northern end of this B155 is now gone due to M25 junction 24. A105 in Wood Green, London A109 in Wood Green, London Renumbered as a portion of the A1080 in the 1970s. The current B155 is not far from this route. B156 A1000 near Potters Bar A10 near Cheshunt B157 A1000 near Brookmans Park B156 in Cuffley Plough Hill, The Ridgeway, Shepherds Hill B158 A602 near Tonwell, Hertfordshire A1000 near Potters Bar, Hertfordshire The B158 originally started from the A10 at Wadesmill, but since the opening of the High Cross bypass, has been truncated. B159 A112 in Leyton, London A104 in Leyton, London Leyton Green Road B160 A104 / A114 Whipps Cross – near Leytonstone, London A110 near Chingford, London Wood Street, Fulbourne Road, Winchester Road and Larkshall Road B161 A114 in Forest Gate, London A112 near Leyton, London Dames Road, Harrow Road, Cathall Road, Francis Road B162 (defunct) A11/A115 in Leytonstone A114 in Wanstead Became a portion of the A114 when it was rerouted, possibly in the early 1930s. A118 in Romford A125 in Romford Now part of A125 and A1251. B163 (defunct) B113 in Stratford, London Stratford Market railway station Section north of the A11 absorbed into the A115 and the southern section was declassified. B164 A11 near Stratford, London B165 West Ham, London Vicarage Lane B165 A112 West Ham, London A118 Manor Park, London Densham Road, Portway, Plashet Road, Plashet Grove, East Avenue, Browning Road, Church Road, Little Ilford Lane B167 A118 Upton Park, London A117 East Ham, London Green Street, Central Park Road, Cheltenham Gardens, Rancliffe Road B168 A11 in South Woodford, London A113 South Woodford, London George Lane, The Viaduct and Daisy Road B169 A110 Chingford, London A112 near Chingford, London Original route was a loop off the A11 (now A104) to serve Loughton; this was renumbered as an extension of the A121 in the mid-1920s. B170 A121 Buckhurst Hill, Essex A113 Chigwell, Essex B171 (defunct) A113 near Chigwell, Essex A121 near Loughton Renumbered to A1168, possibly when the M11 was built and M11 junction 5 (Loughton Interchange) put in. B172 A104/A121 Wake Arms Roundabout, near Loughton Essex A113 Abridge, Essex B173 A113 Woodford Bridge, London A1112 Chigwell Row, Essex B174 A1112 near Collier Row, London A12 near Mawneys, London Formerly went to A113; this section north of A1112 became part of an extended A1112. B175 B174 near Romford, London A113 Passingford Bridge, Essex B176 A1170 Turnford near Cheshunt, Hertfordshire A121 Waltham Cross near Cheshunt, London Original route ran from Ilford to Beacontree Heath; this was upgraded to the A1083 in 1925. B177 A124 Barking, London A12 Goodmayes, London Passes Goodmayes railway station B178 A1112 Dagenham East, London A1306 Dagenham, London Formerly went north to what is now A1240; this became part of rerouted A1112. B179 A112 Walthamstow, London A503 Walthamstow, London Original route ran from Hoddesdon to Stanstead St Margaret's; this was upgraded to Class I status as a spur of the A10 in 1935 and later renumbered A1032, then downgraded to an extension of the B180, and downgraded again in the 1980s to Class III status as the C43 when the roads at both ends were upgraded. B180 B181 Stanstead Abbotts, Hertfordshire B1004 Widford, Hertfordshire B181 A1170 Stanstead St. Margarets, Hertfordshire A414 Tyler's Green, Essex B182 B181 near Epping B1393 Epping B183 A414 Harlow, Essex B1256 Takeley, Essex B184 A128/A414 Chipping Ongar, Essex M11/A11/A1301 Ickleton, Essex B185 A1023 Brentwood B186 Brentwood near Rail Station B186 A128 Brentwood A1306 West Thurrock B187 B186 Cranham, London A124 Upminster, London B188 A1013, Thurrock A128 near Orsett, Thurrock B189 A126 Grays Thames Road/Argent Street Roundabout B190 (defunct) A1 (now B197)/B653 in Stanborough A1 in Lemsford The eastern side became a portion of the A1000 in the 1970s with the southern section now A6129 and the northern now B195. B191 A1083 Green Lane, London A124 Longbridge Road, Dagenham, London Bennett's Castle Lane B192 A123 Gants Hill, London A1400 near Gants Hill, London Beehive Lane B193 A1000 Great North Road, Barnet, London A110 East Barnet, London Longmore Avenue B194 A1170 Broxbourne, Hertfordshire A121 Waltham Abbey, Essex Connects Lower Nazeing with A roads B195 A1000 near Welwyn Garden City A414 Cole Green B196 (defunct) A11 B174 Became part of an extended A1112. B197 B656, Baldock A6129/A1(M)/B653 Breaks along A602 through Stevenage B198 A47 near Wisbech A47 near Wisbech This is the old A1135, which replaced part of the A47 when the bypass opened in 1984. Road number is also in use near Cheshunt (see below). B198 A10 / A121 junction near Waltham Cross B156 in Goff's Oak near Cheshunt The Cheshunt Southern Relief Road, formerly part of the A121 and renumbered around the time this section of the M25 was completed. Road number is duplicated in Wisbech (see above) with both still being in use. B199 B1003 A15 in Lincoln This is the old A57 renumbered in 2017 because the A57 was rerouted south. Road number is also in use near Cheshunt.
Zone 1 (4 digits)