The A3 in Surrey is closed in both directions between the A322 (Dennis Interchange) and the A3100 (Burpham Interchange) near Guildford, due to a serious collision.
Surrey Police is on the scene with National Highways service providers.
The road is expected to remain closed for accident investigation work well into Tuesday’s morning rush hour.
Diversions are in place.
In an update, police confirmed that a pedestrian had been involved in a serious collision on the carriageway in the early hours of the morning.
Officers are appealing for witnesses and information and the road remains closed for incident investigation work that is being carried out at the scene.
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A3 closed due to crash in early hours - latest updates