B roadss are numbered routes in Great Britain of lesser importance than A roadss. See the article Great Britain road numbering scheme for the rationale behind the numbers allocated.

Zone 5 (3 digits)

B5000 to B5099

B5100 to B5199

B5200 to B5299

B5300 to B5399

B5400 to B5499

B5500 to B5999

References