1, number time: The lower the letter, the smaller the number of license plates with the same driving area. That is, the chronological order of numbering from morning till night is Shanghai A, Shanghai B, Shandong C and Shanghai D.

2. Driving area: Shanghai A, Shanghai B and Shanghai D license plates are Shanghai urban license plates; Shanghai c license plate is an outer suburb license plate and cannot enter the outer ring road.

3. Shanghai A: Most of them are buses, such as buses and trucks.

Shanghai B: Nothing special. There are both buses and private cars, and there may be more private cars.

Shanghai c: suburban cars are not allowed to enter the outer ring.

D: mainly taxis.

Extended data:

Huang Hu C is a suburban license plate. According to the regulations, you can only drive outside the outer ring road and are not allowed to enter the urban area. Blue: minibus, private car or operating car,

For example, taxis and private cars are basically blue license plates, including Shanghai A, Shanghai B, Shanghai C, Shanghai D and Shanghai E***, with white characters on a blue background and the same format as yellow license plates. Among them, Shanghai Area C is different from other traffic areas, only outside the outer ring road. White: License plates used by police, armed police and troops.

The license plate is the registration of the number and information of each car. Its main function is to know the area of the vehicle through the license plate, and also to find the owner and registration information of the vehicle according to the license plate.

References:

Baidu encyclopedia-license plate