The UK and France have announced new measures to prevent "undocumented migrants" entering the Channel Tunnel by tackling the criminals who smuggle them to Calais and across the Channel.
The plans include the creation of a joint police operation aimed at tackling the people-smugglers who profit from the desperation of those trying to reach British shores.
Kent Police have extended Operation Stack to cover five junctions of the M20 as heavy freight traffic and disruption at Calais continue to cause delays.
The motorway closure will now run between junctions 8 and 13, affecting the coastbound traffic.
Tourist and local traffic is being diverted onto the A20 from Junction 8 at Hollingbourne to allow backed-up freight traffic to park on the coastbound carriageway of the M20. Channel Tunnel-bound traffic can then rejoin the M20 at junction 11.
Police had earlier said that the problems were being exacerbated by freight drivers trying to bypass the queues on the M20 by joining the domestic traffic.
A joint police operation has been launched to target people-smugglers who profit from the desperate migrants trying to reach the UK.
Calais' Mayor has accused Cameron of treating the region with "contempt" - and called on authorities to open the border unless help is given
More fencing and extra sniffer dogs have been sent from the UK to Calais in a bid to curb migrant incursions into Britain.