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B roads are numbered routes in 
Great Britain
Great Britain is an island in the North Atlantic Ocean off the northwest coast of continental Europe. With an area of , it is the largest of the British Isles, the largest European island and the ninth-largest island in the world. It is ...
of lesser importance than A roads. See the article Great Britain road numbering scheme
The Great Britain road numbering scheme is a numbering scheme used to classify and identify all roads in Great Britain.
Each road is given a single letter (which represents the road's category) and a subsequent number (between 1 and 4 digits). ...
for the rationale behind the numbers allocated.
3 digits
4 digits (40xx)
4 digits (41xx)
4 digits (42xx)
4 digits (43xx)
4 digits (44xx)
4 digits (45xx)
4 digits (46xx)
References
{{DEFAULTSORT:B Roads in Zone 4 of the Great Britain Numbering Scheme 4 4