Why is the validity period only 2 years for the 6-year exemption from inspection?

[SanAva]

Small and micro non-operating passenger vehicles are inspected once every 2 years within the first 6 years, so the validity period on the vehicle license is 2 years. Here are the specific regulations: 1. Passenger vehicles: Operating passenger vehicles are inspected once a year within the first 5 years; those over 5 years old are inspected once every 6 months. 2. Trucks: Trucks and large or medium-sized non-operating passenger vehicles are inspected once a year within the first 10 years; those over 10 years old are inspected once every 6 months. 3. Small and micro non-operating passenger vehicles: Small and micro non-operating passenger vehicles are inspected once every 2 years within the first 6 years; those over 6 years old are inspected once a year; those over 15 years old are inspected once every 6 months.