B4279 (South Wales)
|Distance:||4.9 miles (7.9 km)|
|Now part of:||B4278, A4093|
|Route outline (key)|
The B4279 was originally allocated to the road between Tonyrefail and Blackmill in South Wales. At the time of road classification, this was the main road to the Rhondda Valley from Bridgend and Swansea, and hence it was one of the first roads to be upgraded to class I - in this case to A4093, probably on 1 April, 1924. The road remains this number, although Tonyrefail has been bypassed and so the eastern end of the former B4279 is now part of the B4278.