The visibility on most of the national road network is reduced by fig, the National Road
Infrastructure Fund reported Sunday. The roads are wet, partially covered with snow and ice.

Visibility on Trakia motorway stands at 50 metres in the region of Stara Zagora and Plovdiv and at 100-150 metres in the region of Bourgas.

Four Balkan Range passes remain closed to traffic: Tvurditsa-Elena, Etropole-Zlatitsa, Troyan-Kurnare, Vurbitsa (Shoumen-Sliven), along with the Shipkovo-Ribaritsa and Veslets-Kounino roads. There is a danger of falling rocks in the regions of Iskur gorge and Koznitsa.

Because of the fog, flights of Bulgaria Air from Madrid, Moscow, Rome, Athens, Vienna and Prague did not arrive at Sofia airport Sunday morning, the airport information service said. Lufthansa's flights to Munich and Frankfurt were cancelled, as were those of the Czech airlines to Prague and Bulgaria Air to Rome, Athens, Vienna and Prague.

Sofia Airport is currently open to outgoing flights only, the visibility is too low for landings, the Transport Ministry said.

Bourgas Airport and Varna Airport operate despite the fog which, however, is too dense for the functioning of Plovdiv and Gorna Oryahovitsa airports.

The Port of Varna remains closed to all vessels due to the fog. Visibility in the area of the port is 150 meters. For the same reason, the Port of Bourgas continues to be closed as well. Navigation along the Bulgarian sector of the River Danube is not obstructed by ice floe, with the exception of Vidin, Lom and Oryahovo, where it is 10 per cent.

The ports of Rousse East, Rousse West, Somovit, Svishtov and Silistra operate under winter conditions. The national road network is trafficable. Road surfaces are predominantly moist, partly iced and snow-covered in some places, said the National Road Infrastructure Fund.

This morning the ice floe on the Danube reached 30 per cent at Lom, the hydrometeorological station in town reported. The temperature of the water was 0 C and of the air - minus 8.5 C.
The water is carrying ice blocks of different sizes, some of them exceeding a length of 0.5 m.