Question Unless otherwise posted, the speed limit in suburban business districts is: Answers 70 mph. 55 mph. 40 mph. 35 mph. Explanation Unless otherwise posted, the speed limit in suburban business 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 47 New Jersey Practice Test 29