What does it mean for a sedan to have a yellow license plate?

[Suzanne]

When a sedan has a yellow license plate, it means the vehicle's body length exceeds six meters, making it ineligible for a blue license plate. The differences between blue and yellow license plates for sedans are: 1. Different driver's license requirements: Blue plates require a driver's license with at least a Class C qualification; yellow plates require at least a Class B qualification. 2. Different operational certificate requirements: Blue plates only need a vehicle registration certificate; yellow plates require both an operational certificate and a vehicle registration certificate. 3. Different applicable vehicle types: Blue plates are for general passenger vehicles, M1 class light buses, and light trucks with a load capacity under 1.0 tons; yellow plates are for large vehicles and ordinary M2 class light buses.