Vehicle owners planning to convert the function of a private car (white license plate) into a commercial transport vehicle (yellow license plate) need to understand the consequences of changes to the validity period of the periodic inspection certificate (KIR). Based on Circular Letter 30, this administrative procedure does not require the owner to undergo a re-physical test at an inspection facility, but there is an adjustment to the certificate's validity duration.
The main principle applied is that the validity period of the reissued certificate must follow the shorter inspection cycle. If a vehicle switches from business operations to private use, the certificate's validity will remain the same as the remaining duration of the previous certificate. Conversely, switching from private to commercial use will trigger a recalculation of the validity period based on the commercial transport vehicle cycle.
The calculation formula established in Circular Letter 30 is the initial inspection date plus the commercial vehicle inspection cycle, minus one day. Note that the testing authority will reject the issuance of a new certificate if the calculated validity period has expired or exceeded the submission date. Under these conditions, the vehicle is required to undergo a comprehensive physical inspection before a new certificate can be issued.
This regulation emphasizes standardization for any vehicle designation modification. Even for changes in seating capacity, owners are still required to follow the shortest validity duration required by safety regulations. This step is taken to ensure that every vehicle unit operating on the road, especially for business needs, is always in roadworthy condition in accordance with current safety standards.
