The delays are westbound between Brogborough and the Kingston roundabout in Milton Keynes.
It is a suspected pile-up.
Traffic delays in Bedford after crash involving five cars and a lorry
The A421 is partially blocked and has queuing traffic because of an accident involving five cars and a lorry.
By The Newsroom
Thursday, 5th January 2017, 10:21 am
Updated Monday, 9th January 2017, 11:53 am