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Motorists should expect delays on the south-bound carriageway of the M20 tonight.
A crash between an HGV and a car closed one of the three lanes of the motorway between Junctions 4 (Leybourne) and 5 (Aylesford).
Police advise drivers to approach with caution and expect severe delays.
Highways officials say the lane re-opened just before 5pm, but traffic remains heavy in the area.
Traffic is also very slow on the A228 Ashton Way between A20 London Road and M20 J4 as a result of tailbacks of cars trying to get on the motorway.