What might indicate that a vehicle is due for inspection?

Answer: B — Expiration of the previous inspection sticker

The expiration of the previous inspection sticker is a clear and definitive indicator that a vehicle is due for inspection. In Pennsylvania, vehicles are required to undergo safety inspections on a regular basis, typically annually. The inspection sticker serves as a visual confirmation that the vehicle has met safety standards within the designated inspection period. Once this sticker expires, it is a legal requirement for the vehicle owner to have their vehicle inspected again before it can be legally driven on public roads. While changes in routine driving patterns, increased fuel consumption, and the activation of a tyre pressure warning light might suggest potential issues or the need for maintenance, they do not serve as formal indicators for scheduled inspections according to Pennsylvania regulations. These factors can be relevant for other types of vehicle maintenance or checks, but they lack the regulatory significance that an expired inspection sticker carries.