For a truck with three axles, what is the maximum speed limit? Do you currently have car insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question For a truck with three axles, what is the maximum speed limit? Answers 45 mph 55 mph 65 mph Explanation In California, the maximum speed limit for trucks and truck tractors with three or more axles is 55 mph. If a lower maximum speed limit is posted, follow the posted limit.