What is the maximum speed allowed to be driven by a truck on a county road? 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 What is the maximum speed allowed to be driven by a truck on a county road? Answers 25 mph 50 mph 70 mph Explanation Unless otherwise posted, the maximum allowable speed for trucks and buses on county roads in Washington State is 50 mph.
