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 i ...

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. United Kingdom A road zones

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