The eastbound carriageway was closed following the collision close to junction 28 just after 12.30pm. The motorcyclist, aged 22, is expected to be named later today. A 50-year-old man was arrested on suspicion of causing death by dangerous driving and is still in custody at Parkside Police Station in Cambridge. The carriageway was closed between Godmanchester and Swavesey and motorists were advised to avoid the area or expect long delays. Queues built up on the surrounding roads in St Ives, Godmanchester and along the A428 as motorists avoided the A14. The road was reopened at around 7.30pm.