The specific division of bus registration is based on indicators such as vehicle turntable, ventilation system, air conditioning system and seat comfort. Advanced large seats meet the above indicators, but ordinary large seats cannot.

2. Different comfort levels

Ordinary big seats are not as comfortable as advanced big seats.

Extended data:

Passenger car seat classification

According to the comfort level and grade, the passenger cars with seats are divided into ordinary, intermediate, advanced one, advanced two and advanced three or five grades.

Passenger cars are divided into seat buses and sleeper buses according to the way of riding. There are buses divided into large, medium and small according to the number of seats.

Medium-sized buses are divided into four grades: secondary, primary, intermediate and ordinary.

Small passenger cars are divided into four grades: secondary, primary, intermediate and ordinary.

Sleeping cars are divided into ordinary, intermediate and advanced.