Is it illegal for speed traps from private property

Thank you to everyone who took the time to answer and assist me. I do have a few follow up questions.
If I ask for a traffic survey for that stretch of highway and they do not have it.
1) what is my next move
2) what law is it
3) where can I get a copy of that law (dept of transportation?)
4) how often does that survey need to be updated?

Thank you to everyone who took the time to answer and assist me. I do have a few follow up questions.
If I ask for a traffic survey for that stretch of highway and they do not have it.
1) what is my next move
2) what law is it
3) where can I get a copy of that law (dept of transportation?)
4) how often does that survey need to be updated?

I didn't mean to do that twice. sorry