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|Location Map ( geo)|
|From:||Cefn Brynich (SO077273)|
|Via:||Talybont on Usk, Llangynidr|
|Distance:||11.7 miles (18.8 km)|
|Meets:||A40, B4560, A4077|
|Route outline (key)|
The road appears to have been first classified at some time around the mid-1930s, as it appears on the 1939 OS Ten Mile Road Map, but not in the 1934 edition.