The road measures 10.91 miles long and would take a car obeying speed limits 24 minutes to travel its length.
The B4251 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 BLACKWOOD, Cwmgelli, Sunnybank, Pontllanfraith, Wyllie, Ynysddu, Cross Keys, Oakdale, Penmaen, The Rhiw, Oakdale Business Park, Argoed, and Crumlin.
The road connects Gwent and Gwent.