The road was closed following the fatal crash this morning, 24th January, but has since been reopened.
Police were called to reports of the incident involving a lorry and cyclist shortly after 6.05am on the eastbound carriageway between the Saddlebow Interchange and Hardwick roundabout.
The cyclist, a man in his 60s, died at the scene.
The driver of the lorry, also in his 60s, has been arrested on suspicion of death by careless driving and remains in custody at King's Lynn Police Investigation Centre.
Anyone who witnessed the incident, has dash cam footage, or saw the manner of driving beforehand is asked to call 101 quoting incident number 49 of 24th January.