Why do some sedans have yellow license plates?

[AliyahFitz]

The reasons why some sedans have yellow license plates include exceeding length limits, meeting weight requirements for yellow plates, or being classified as special vehicles. Specific reasons are as follows: Exceeding length limits: If the vehicle body length exceeds 6 meters, a yellow license plate is required. A sedan with a yellow plate indicates that its body length is too long to meet the blue plate standards for sedans, thus requiring a yellow plate. Meeting weight requirements for yellow plates: Vehicles with a total mass of 4.5 tons (inclusive) or more, or carrying 20 passengers (inclusive) or more, must display yellow license plates. Special vehicles: Vehicles such as driving school cars and taxis are classified as commercial vehicles, hence requiring yellow license plates. Yellow plates also require an operating permit and must undergo quarterly inspections. Additionally, yellow-plated vehicles need a special permit to operate within urban areas.