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The M20 between Junctions 9 and 11 is now open in both directions following roadworks.
Highways England says the works were completed ahead of schedule.
The Londonbound carriageway opened just before 7pm yesterday, 11 hours ahead of schedule.
This was followed by the coastbound carriageway reopening at around midnight.
The motorway had been shut between the western Ashford and Stanford/Hythe turnoffs from 10pm on Friday.
Contractors had spent the weekend demolishing the Highfield Lane bridge, which crossed over the motorway just east of the existing Junction 10.
This was for the creation of the new Junction 10a, which is expected to open this autumn.
The replacement Kingsford Street bridge is already there and its installation needed a similar motorway closure in November.
Drivers had been diverted towards the M2 and A2 during the closure times.