1.   Roadblocks caused heavy congestion.

2.   Roadblocks caused huge traffic jams in the area.

3.   The intermittent roadblocks caused traffic delays along a highway connecting Athens with the northern port of Thessaloniki, and at border crossings with Bulgaria and Macedonia.

4.   Their roadblocks have caused virtual gridlock on major roads across the country, particularly in the Basque, Santander and Catalunia regions in northern Spain.

5.   Roadblocks caused traffic jams as police searched cars and checked ID papers.