The road measures 13.64 miles long and would take a car obeying speed limits 23 minutes to travel its length.
The B4306 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, Llangyndeyrn, Crwbin, Bancffosfelen, Pontyberem, Llannon, and Pontarddulais.
The road connects Dyfed and Dyfed.