In 2020, the classification of toll road vehicles abandoned the previous classification method of classifying according to the approved load quality and the total axle number, and clearly divided the blue brand trucks and other two-axle trucks into two categories, with the blue brand trucks being 1 and the other two-axle trucks being 2 categories. Classify 4.2m or 1 vehicles, and directly reduce the charges of such vehicles by one level.
A blue car refers to a car with a blue license plate. License plates are usually white wireframes with white characters on a blue background. This number plate is installed on trucks with a total mass of less than 4500KG (excluding) and cars with less than 20 seats (including) and a body length of less than 6 meters (excluding).