The road measures 13.00 miles long and would take a car obeying speed limits 27 minutes to travel its length.
The B4309 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 Cwmffrwd, Bancycapel, Pontantwn, Meinciau, Pontyates, Cynheidre, Five Roads, LLANELLI, and Furnace.
The road connects Dyfed and Dyfed.