Hundreds of cars and trucks are stuck in a massive traffic jam in western Ukraine.

A blizzard has blocked traffic for hours, and many drivers are complaining that they're running out of petrol simply from keeping their engines idling to stay warm.

Emergency services were working to clear roads and dig out cars from deep snow, as well as deliver food and warm drinks to the stranded drivers.

Social media websites were reporting the situation as critical in some places as drivers began to run out of food and water.

Ukraine's Emergency Ministry said that over 18,000 rescue workers were deployed and that over 4,000 vehicles were working to clear snow from roadways.