The road measures 12.88 miles long and would take a car obeying speed limits 19 minutes to travel its length.
The B4389 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 Llanfair Caereinion, New Mills, Tregynon, Bettws Cedewain, Aberbechan, Llangyniew, and MEIFOD.
The road connects Powys and Powys.