A38 rolling road block as huge concrete beams transported to Plymouth The massive beams are for the construction of the Forder Valley Link Road in Plymouth The video will auto-play soon8Cancel Play now A rolling road block is causing delays on the A38 this evening as four lorries escort massive concrete beams to Plymouth. The huge concrete beams are being transported to Plymouth for a major construction project ongoing in the city: The Forder Valley Link Road. The beams are currently being stored at the disused Plymouth Airport site. The spectacular beams are currently being transported through Devon on the A38 after causing traffic issues on the M5.