Soon after emptying some coal-based oils and other chemicals, the drivers directly load edible soybean oil into their tanks for the next trip, thus increasing the risks of food contamination.

一罐车运输行业存在食品类液体和化工类液体运输混用且不清洗的情况，有的罐车运完了煤制油，再装运食用油，大大增加了食品污染的风险。