B4278 Road

From: A4058 near Porth
To: A4233 near Stanleytown,A4058 near Llwynypia, Note: This road was originally the A4233 and A4058 but following the completion of the Porth Relief road these roads were downgraded.
Roads: Ynyscynon Road
Cities: Porth, Tonypandy, Tonyrefail, Llwynypia.