The road measures 28.66 miles long and would take a car obeying speed limits 50 minutes to travel its length.
The B4337 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 Talley, Llansawel, Rhydcymerau, Ty Mawr, LLANYBYDDER, Rhydybont, Alltyblacca, Llanwnnen, Cribyn, Felinfach, Talsarn, Cilcennin, Cross Inn, Nebo, Rhiwbwys, and LLANRHYSTUD.
The road is located entirely within Dyfed.