One incident has been reported in the county this morning but traffic is slow on a number of roads.
Delays have been reported between the Drusillas roundabout and Selmeston.
Delays are said to be increasing on A27 Chichester Bypass eastbound between the Emsworth Services and A286 Stockbridge Road (Stockbridge roundabout).
There are also queues on A259 Cathedral Way (Fishbourne roundabout) and the Bognor Bridge roundabout.
In Worthing, two-mile tailbacks have been reported on the A27 eastbound. Delays said to be increasing in the area.
There is also westbound traffic on Upper Brighton Road between Church Lane and Forest Road.
Meanwhile, A283 roadworks are reportedly causing delays in both directions between Steyning and Shoreham.
Towards the north of the county, between Horsham and Faygate, there is slow traffic on A264 westbound at B2195 Crawley Road (Moorhead roundabout).