Question Unless otherwise posted, the speed limit in suburban residential districts is: Answers 10 mph. 35 mph. 45 mph. 65 mph. Explanation Unless otherwise posted, the speed limit in suburban residential districts is 35 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 49 New Jersey Practice Test 40