The incident happened on the northbound carriageway, close to junction 28 for Colchester, shortly after 10.30am on Monday, August 10. The lorry driver passed all roadside tests and will be interviewed in the coming days. The A12 was closed in both directions to allow emergency services to work quickly at the scene. Traffic was queuing as far back as past the Suffolk border for most of the day. "Our investigation is progressing and we will be interviewing a driver of a lorry in the coming days.