The road measures 12.24 miles long and would take a car obeying speed limits 22 minutes to travel its length.
The B4338 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 Synod Inn, Talgarreg, Gorsgoch, Cwrtnewydd, Drefach, Llanwenog, and LLANYBYDDER.
The road connects Dyfed and Dyfed.