Question Unless otherwise posted, the speed limit on rural roadways is: Answers 25 mph. 35 mph. 50 mph. 65 mph. Explanation Unless otherwise posted, the speed limit on unmarked rural roadways is 50 mph. If a different speed limit is posted, you should follow that speed limit. Pass your DMV Written Test with flying colors Take me to the cheat sheet New Jersey This questions appears in the following tests: New Jersey Practice Test 29 New Jersey Practice Test 6