There are emergency barrier repairs taking place following this morning's crash involving a car and a lorry between J14-15.
Motorists are being warned to avoid the M1 until this evening.
There are currently delays of an hour due to 2 lanes (of 3) being closed between J14 and J15.
The lanes are closed whilst emergency barrier repairs are carried following a collision earlier this morning.
Works expected to be complete by 5pm.