How many years later does a sedan require two inspections per year?

[LaDakota]

Private cars require two inspections per year after 15 years. Small and micro non-operational passenger vehicles (i.e., private cars) must be inspected once every 2 years within the first 6 years; after 6 years, once per year; after 15 years, twice per year, with exhaust emission tests conducted on the same dates as the annual inspections. The validity date for new car inspections is annotated to correspond with the month of the registration date 2 years later. The following materials are required for annual vehicle inspection: 1. The vehicle; 2. Vehicle license: both original and duplicate must be complete; 3. A valid one-year motor vehicle third-party liability insurance policy within the validity period. If the vehicle is purchased via installment payments and the original insurance policy is unavailable, provide a copy of the insurance policy (stamped by the insurance company), an insurance card, and an explanation; 4. Proof of identity and a copy. Note that both the original and copy are required, and the ID copy should be neatly trimmed along the edges. For company vehicles, the agent's proof of identity is required.