The European Commission on Tuesday proposed a final six-month extension for five countries to maintain frontier checks inside the borderless Schengen zone.

If the plans are approved by EU capitals, Austria, Germany, Denmark, Sweden and Norway will be permitted to continue checking travelers at their borders, something they started doing in response to the refugee crisis.

Since giving countries the leeway to reimpose checks for a limited time in May 2016, the Commission has agreed to extend the permission for three months in November and again in February.

The proposal is the last possible extension under Schengen rules.

“The time has come to gradually return to a fully functioning Schengen system, and we propose the concrete steps to do it,” said Home Affairs Commissioner Dimitris Avramopoulos. “We recommend that temporary Schengen internal border controls be prolonged for one last time.”

The migration crisis has peaked, with the EU saying that since it struck a deal last year with Turkey over migrant returns, arrivals to Greece have dropped by 97 percent. But the Commission said that EU countries are at risk of “irregular secondary movements” within the bloc, with some 60,000 migrants still in Greece waiting to move on.

The checks cover Austria’s border with Slovenia, Germany’s with Austria, Denmark’s with Germany (including ferry links), Swedish harbors in the south and west, and Norwegian ports with ferry connections to Denmark, Germany and Sweden.

At the end of the line in Slovenia, officials have been nervous that checks will cut into cross-border trade, as traffic delays mount along the border with Austria. Robert Sever from Slovenia’s Chamber of Commerce and Industry said in February that roadside checks added 30 minutes to average transit times and cost hauliers €2 a minute.

Avramopoulos said he plans to visit the region soon and that the Commission would publish guidelines in the coming days to clarify how border checks can be carried out. He said checks should only be done in a “targeted and limited manner” and only as a “last resort.” Instead of systematic checks, countries should work on better policing border areas.

Sweden also announced on Tuesday that it would stop checks along its border with Denmark immediately and instead focus on broader police and customs checks, local media reported. A Swedish government spokesperson did not return a request for comment.

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