The Highways Agency said it decided to keep the Boston Manor Viaduct closed because during works it found a crack in a "sensitive location", which requires it to be kept closed until it is repaired.
Diversion on the A312 and the A4. Drivers are being advised to allow extra time for their journeys.
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A Kent school has issued a newsletter naming and shaming the parents who drive over a nearby cemetery to pick up their children.
Friday night's forecast for the east of the region
Friday night's forecast for the west of the region