Which type of vehicle inspection has the lowest cost at $0.25?

The type of vehicle inspection with the lowest cost, at $0.25, is the moped inspection. This is due to the nature of mopeds being smaller and less complex compared to other vehicles, which often require more comprehensive inspections and higher associated costs. A moped is generally considered a low-powered vehicle, and the regulatory framework reflects this by establishing a lower fee for inspections.

In contrast, motorcycle inspections, trailer inspections, and commercial vehicle inspections typically involve more extensive safety checks and compliance requirements, which justifies their higher fees. Therefore, the moped inspection's minimal fee aligns with its simpler safety requirements, making it the most economical option.