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An HGV fuel spillage in roadworks on the M20 caused miles of tailbacks.
Drivers say four miles of traffic was queuing between junctions 9 and 8 after a lorry hit a temporary works barrier just after 1pm.
The incident, which caused a single lane closure, occurred on the M20 London-bound carriageway.
Highways England has introduced the roadworks on the stretch as it is working on a temporary solution to help avoid the need to activate Operation Stack on the M20.
The works, costing £25 million, will allow for two-way travel on the London-bound carriageway between junctions 8 and 9 from March 2019 at periods of extraordinary cross-Channel disruption.
Narrow lanes and a 50mph speed restriction are in place while construction is carried out. Work began in July.
All lanes have since re-opened, but a 15 minute delay is still to be expected by drivers.