|Location Map ( geo)|
|From:||Ystrad Rhondda (SS996943)|
|Distance:||8.9 miles (14.3 km)|
|Met:||A4058, B4278, B4279, A473|
|Now part of:||A4058, A4119, B4278|
|Route outline (key)|
The B4271 was originally allocated to the road connecting Ystrad in the Rhondda Valley with Llantrisant in the Ely Valley.
On 1st April, 1924, the section from Ystrad to Tonyrefail was upgraded to become part of the A4093. A year or so later, the entire of the ex-B4271, including the section already mentioned, was upgraded to become the A4119.
Since the late 1980s, the construction of new relief roads in the area has diverted the A4119 away from its original course. The majority of the ex-B4271 is now either unclassified or part of the B4278.