The crash, which occurred around 2.15pm, involved a lorry crossing the central reservation and causing extensive damage to the infrastructure.
Police completed their crash investigation hours after the incident, allowing National Highways to begin assessing the damage to the road and central reservation barriers.
Lane 2 of both directions remains closed on Tuesday morning, January 14, as emergency barrier repair works are carried out to ensure the safety of drivers before the road fully reopens.
READ MORE: Diversion routes announced as A303 closed for several hours
According to National Highways, assessing and repairing the infrastructure damage is often delayed until police investigations at the scene are complete.
The damage caused by the this crash required not only the removal of the vehicles involved but also significant repairs to the central reservation barriers.
Repairs are progressing steadily, though there is no confirmed timeline for when all lanes will fully reopen.
National Highways has urged drivers to remain patient and to monitor traffic updates before planning their journeys.