No one likes to be unpopular, or be wrong.
Is there a way to make your point and have a good nights sleep if you find a problem?
Sure.
Put it in writing to the lowest level in authority that you know of, with a non-disclosure statement if you like, but the authority will probably have something like this anyway.
If you like, put a cc:your lawyer.
Stick to the facts, don't get agressive in the tone, and don't jump to conclusions. Also do your homework to make sure you are right.
Make sure you send it registered mail, and keep a copy. In fact, you might mail a copy to yourself, and do not open the letter- that way you have proof of when you sent it to the authority.
If you don't have an answer in a reasonable period of time, send another letter with a copy of your first to the highest person in the authority, again registered mail. In this letter, ask when you can expect a response as you have had none to your previous letter.
The linear s**t accelerator will take over at this point, and you should have some sort of answer pretty soon.
You may not be popular, but at least you have done what you think is correct.
Having a letter on file on the subject is pretty haunting to the authority, because if there ever is an accident that could be traced back to them not taking action, they are culpable (or at least a good lawyer could make a case for that).
And you would be sure to let the press know that they should do a freedom of information access request (or whatever it is known as in your country) to dig out the issue.