What is the frequency of inspections for vehicles classified to be inspected annually?

The correct answer is that vehicles classified for inspection must be inspected annually, which means they are required to undergo a safety and emissions inspection once a year. This frequency helps ensure that vehicles remain in safe operating condition and meet environmental standards set forth by the state. Regular annual inspections are important for identifying safety issues and ensuring compliance with emissions regulations, thereby keeping roads safer and contributing to better air quality.

In contrast, the other frequencies listed, such as every three months, twice a year, or every two years, do not align with Pennsylvania's regulations regarding annual inspections. Such policies aim to balance vehicle safety and environmental responsibility with practical scheduling and compliance from vehicle owners.