A collision on the A27 in Shoreham led to the road being closed for nearly two hours.
Officers were called to the Shoreham bypass at 6.19pm today following a three-vehicle collision.
The road is currently closed in both directions while police await recovery of the vehicles.
No injuries were reported.
A police spokesman described ‘extremely heavy traffic’ and said the road would be blocked for ‘quite a while’.
Highways England announced the road reopened about 8.14pm that evening.