How long does a sedan need to be to require a yellow license plate?

[Juan]

Vehicles exceeding 6 meters in length must use yellow license plates. Below is relevant information about license plates: 1. Classification of license plate colors: There are four background colors for vehicle license plates—blue, yellow, white, and black. 2. National license plate standards: The dimensions for large vehicle license plates are: front—440*140 (same as small vehicles); rear—440*220. According to the 'Motor Vehicle Registration Regulations,' medium-sized buses, large buses, and city buses use yellow plates; medium-sized trucks, large and medium-sized trucks, and trailers also use yellow plates. The vehicle type is determined based on the model specified in the motor vehicle's factory certificate.