What is the frequency of safety inspections for unmarked vehicles?

• A. Every 6,000 miles or 6 months
• B. Every 24,000 miles
• C. Every 12,000 miles or 12 months from the previous service, whichever comes first
• D. Every 3 months

Answer: (C)

The schedule operates on both time and distance, using whichever happens first. For unmarked agency vehicles, safety inspections are due at the earliest point you’ve reached either 12,000 miles since the last service or 12 months since the last service. This ensures maintenance happens promptly whether the vehicle accumulates miles quickly or slowly, and it prevents aging components from going too long without inspection.

For example, if 11,500 miles have been driven and 11 months have passed, you’d inspect as soon as you reach 12,000 miles. If 12 months pass before hitting 12,000 miles, you’d inspect at the 12-month mark. If you hit 12,000 miles in five months, the inspection occurs at that 12,000-mile point, since that comes first. This approach balances wear from use with the need to check aging parts over time, rather than sticking to a fixed mileage or fixed calendar interval alone.

Other schedules that use only a fixed mileage like every 6,000 miles or only a fixed time like every 3 or 6 months don’t account for how hard the vehicle is used, nor do they prevent inspections from being delayed if the vehicle accumulates miles slowly. A schedule of every 24,000 miles would risk missing timely checks for vehicles that accumulate miles quickly.