The cause of a fire which raged for five hours on the M4 was accidental, according to a fire service statement.
People living near the Briton Ferry Bridge in Neath Port Talbot described hearing explosions just after 11pm on Saturday night. Videos showed huge flames and smoke plumes coming from a lorry on the bridge.
Traffic monitoring service Inrix said there was an accident near Junction 42 where "a vehicle involved caught fire". It took five firefighting crews around five hours to fully extinguish the blaze. The road has reopened eastbound but the westbound carriageway remains closed as of 8.45am on Sunday.