 Two main roads service the area , the A4058 runs through the Rhondda Fawr and the A4233 services the Rhondda Fach . The A4058 starts at Pontypridd runs through Porth before ending at Treorchy , where it joins the A4061 to Hirwaun . The A4233 begins outside Rhondda at Tonyrefail , heading north through Porth and through the Rhondda Fach to Maerdy , where the road eventually links up with the A4059 at Aberdare . Two other A roads service the area ; the A4119 is a relief road , known as the Tonypandy Bypass and the other is the A4061 which links Treorchy to the Ogmore Vale before reaching Bridgend . 
