Live M1 southbound updates as crash between junctions 29 and 28 causes delays 'Congestion is building on the approach' Delays are building on the M1 southbound following a collision between junction 28 and 29 southbound. Highways England said the incident happened southbound between J29 (Mansfield / Chesterfield) and J28 (Tibshelf). Traffic monitoring site Inrix is reporting two lanes are closed and traffic is queuing at the scene of the accident. The site suggests two cars are involved and lanes three and four (of four) are closed. A spokesman for Highways England said: "The M1 southbound J29 (A617 Mansfield Matlock) to J28 (A38 Mansfield Matlock ), two lanes have been closed due to a collision. Traffic Officers are currently at scene. Recovery are on their way to the area to assist. Congestion is building on the approach.