Question Unless posted otherwise, the speed limit on an open county highway is: Answers 70 mph. 65 mph. 60 mph. 55 mph. Explanation The speed limit on open county highways is ordinarily 55 miles per hour. If another speed limit is posted, follow the posted speed limit. Pass your DMV Written Test with flying colors Take me to the cheat sheet West Virginia This questions appears in the following tests: West Virginia Practice Test 2 West Virginia Practice Test 13