Answer:
Between sentences 2 and 3
Explanation:
It makes most sense to put this sentence after the second sentence because it is in this sentence when the speed limit of 25 mph is introduced. Because the subject of this sentence is speed, adding another sentence saying why the actual speed limit doesn't help protect kids makes most sense here. This is especially true because of the transition word (however). You want to put a sentence about why the actual speed limit is irrelevant directly after it.
