Which vehicles are exempt from inspections?

The exemption for trailers under 3,000 pounds from safety inspections is rooted in regulations that categorize lighter trailers as less likely to pose safety issues compared to heavier and more complex vehicles. The reasoning behind this exemption is that smaller, lighter trailers typically have less impact on road safety and are often used for less intensive purposes. Therefore, they are not subject to the same rigorous inspection requirements as heavier vehicles.

It's important to understand the context of the other options. While vehicles over 20 years old may have certain considerations for classic car enthusiasts, they are generally not exempt from safety inspections in Pennsylvania. Vehicles owned by the military, despite their special status, still require inspections to ensure they meet safety standards just like any other vehicle. Lastly, the statement that no vehicles are exempt is inaccurate as it overlooks specific categories of vehicles that are indeed excluded from the inspection process.