Motorists are being warned that the M5 remains closed in both directions at Bridgwater due a substantial spillage caused by an overturned chemical tanker.Around 1,000 litres of kerosene were spilt across three lanes of the northbound carriageway and the hard shoulder earlier this morning (Wednesday).Devon and Somerset Fire and Rescue Service, along with Avon and Somerset Police and the Environment Agency are attending the scene, between junctions 23 and 24. Drivers are currently being diverted from the M5 on to A38 at both junctions. But a spokesperson for Highways England said the southbound carriageway would reopen at around 6pm following the recovery of the tanker and the decanting of a further 5,500 litres of kerosene left on the vehicle.The northbound carriageway will need resurfacing overnight but it is hoped that one lane will open after 6pm to help relieve traffic diverting through the centre of Bridgwater and surrounding area. The northbound carriageway will need to be completely re-closed later in the evening to allow resurfacing to take place but is expected to reopen in time for the morning rush hour tomorrow. Drivers are advised of severe congestion in the area and to check their route before travelling and listen to traffic updates.