B roads in Zone 5 of the Great Britain numbering scheme

The numbering zones for roads in Great Britain 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 5 (3 digits) Road From To Notes B500 A40 at Holborn Circus A1 at Barbican tube station Charterhouse Street and Long Lane around Smithfield Market B501 A401 at Islington B500 Charterhouse Street, Smithfield Market St John Street, except for the section north of Rosebery Avenue which is part of the A401 B502 A4200 at Russell Square B144 Bath Street in Finsbury This road is split into two parts by the A201 and A401 at Mount Pleasant B503 (defunct) A401 at Mount Pleasant A501 at Kings Cross Now part of the A201. B504 A5202 at St Pancras B502 at Bloomsbury Northern section passes St Pancras International on the west side and is southbound-only for through traffic. B505 (defunct) A40 at Oxford Circus A400 at Camden Upgraded to a portion of the A4201, but that was later rerouted onto the parallel Portland Place instead of Great Portland Street, returning it to Class II status, but it became the B506 instead of the B505. The section along Mortimer Street is now