The road measures 3.35 miles long and would take a car obeying speed limits 5 minutes to travel its length.
The B4556 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 Gorslas, Penygroes, Caerbryn, Blaenau, Saron, and Llandybie.
The road is located entirely within Dyfed.