I was given a ticket for speeding in a school zone. I was unaware that there was a school zone because as I was traveling in the left lane there was a rolling road block of several trucks that were turning onto a street right after the sign. The sign is a flashing light that says "speed limit 25 when flashing" and I had no knowledge the sign existed because it was impossible to have seen it with the trucks that obstructed it from my view. Is there any case law about this or what would I say to the judge to explain that I am not liable as it was not possible to have known due to the sign being blocked. After I was ticketed I went into the neighborhood and found the trucks (there were several large moving trucks, so I had reason to believe they were still there loading or unloading) and I took a picture showing them and also the street sign was in the picture showing the location. I also had another person in a different vehicle several hundred feet behind me that was able to see the sign and was a witness to the trucks creating a rolling road block. This is in Michigan if it makes a difference. Thanks!
Edit: The road I was traveling on the speed limit is 45mph which is what I was doing. There was a single sign that flashes a light only when the school zone is in effect. There was no reason to believe it was not "prudent" to travel at 45. There was also no reason to believe there was a school zone as it was impossible to see the ONLY sign indicating such. I have a witness traveling behind me that can contest to the inability to see such a sign and I went back and took pictures of the moving trucks in the neighborhood to show what it was that prevented me from seeing the sign. The only way for anyone to know there was a school zone in effect was seeing a flashing light which was not visible with the trucks traveling next to me.
By rolling road block I did not mean any sort of construction vehicle or anything such that would warn of any changes or anything. It was simply several trucks in the right lane which obstructed my view of a sign on the other side of the trucks. Not like the trucks that have flashing lights behind workers filling potholes or anything. Just a giant vehicle directly to my right that prevented me from seeing the only sign informing me the speed limit had changed.