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Long delays built up after the A20 Swanley Bypass was shut for recovery work following a crash.
The westbound stretch was closed between the junction for the M25 and the M20 (the Swanley Interchange) and the Sidcup Bypass at Crittalls Corner.
There were reports of a car facing the wrong way near McDonald's, which is just before the Sidcup Bypass.
The road has now re-opened and the tailbacks have cleared.
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