Final answer:
The speed limit on a non-hard surface county road is typically 30 mph, unless otherwise posted.
Step-by-step explanation:
The speed limit on a non-hard surface county road is typically 30 mph, unless otherwise posted. This means that unless there is a specific sign indicating a different speed limit, the default limit is 30 miles per hour. It is important to note that speed limits can vary depending on the region and specific road conditions, so it is always a good idea to obey any posted signs.