A serious accident on the M27 near the A27/M275 interchange in Hilsea, Portsmouth, has led to significant road closures, with traffic diverted and delays extending towards Fareham. Hampshire Police reported that the M27 is closed from J12 Eastbound, impacting the M275 as well. Organizers of the Victorious Festival have advised attendees to leave early due to the traffic situation. Meanwhile, in Cambridgeshire, a multiple vehicle collision on the A1(M) has prompted the closure of the southbound carriageway between Junction 15 and Junction 13, with emergency services, including an air ambulance, on the scene. National Highways has issued a diversion and warned of delays as millions of additional journeys are expected over the Bank Holiday weekend.