Heavy snow and strong winds have caused traffic havoc in Croatia and Slovenia, as authorities closed down many roads and restricted truck traffic to cope with the winter storm.

Travel throughout Croatia was snarled Friday following a massive all-night snowfall. Trucks have been banned from all roads connecting Croatia's mainland with the Adriatic coast, where strong winds have disrupted ferry lines.

In Slovenia, dozens of schools have closed down and most border crossings have banned entry for trucks to prevent pileups. Still, several trucks slid off a highway in the southeast, temporarily blocking traffic and sending road emergency crews to the scene.

Slovenia's Adriatic port of Koper closed down because of gale winds, along with sections of the motorway connecting the coast with the capital of Ljubljana.