At least 800 cars and trucks were stuck in Kashiwazaki around 1 a.m. Tuesday. The number was reduced to around 300 vehicles three hours later as work to remove snow continued throughout the night, according to the authorities. The Japan Meteorological Agency on Tuesday warned of another snowstorm and potential traffic disruptions in the Sea of Japan coastal regions from Thursday to Sunday as a cold spell grips the Japanese archipelago. Kumi Miyazawa, a 52-year-old elementary school teacher, said she spent a sleepless night stuck in a traffic jam that began Monday afternoon. Despite being there for more than 15 hours, her car had only moved 50 meters by Tuesday morning. Drivers helped each other, she said, with some trying to shovel out a car that had gotten stuck in the snow. A nearby company office distributed drinks and let people use its bathroom, she said.