The road measures 13.37 miles long and would take a car obeying speed limits 21 minutes to travel its length.
The B4340 is a B Road and is located in the Zone 4 Highways Region.
This is a true long-distance route, journeying through numerous towns like Rhydyfelin, Southgate, Dyffryn Paith, New Cross, Abermagwr, Crosswood, Llanafan, Tynygraig, YSTRAD MEURIG, and Pontrhydfendigaid.
The road is located entirely within Dyfed.