Delays are building on the M1 northbound after a lorry shed its load of glass.
Emergency services are en-route to the scene - following a separate crash - near junction 30. The road is now blocked.
Heavy traffic is also causing delays on the M1 southbound ahead of rush hour.
Motorists should expect delays of about 10 minutes between junctions 34 and 32.
Normal traffic conditions are expected to resume later this afternoon.