The road measures 26.82 miles long and would take a car obeying speed limits 47 minutes to travel its length.
The B4310 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 Nantgaredig, Llanarthney, CARMARTHEN, Porthyrhyd, Felingwm, Brechfa, Abergorlech, Llansawel, Llanddarog, Drefach, Tumble, and Upper Tumble.
The road is located entirely within Dyfed.