Take pictures of where you were parked and all the signage around it. You should have an area to check in the ticket where you can object to having been issued the ticket. Submit the photos and a written description to why you think the ticket was given in error.
I do a lot of work in Washington DC and made a left turn on to 14th street from the south portion of Pennsylvania Ave and got lit up and pulled over close to the new black history museum. The officer asked me if I made that turn and I replied "yes", then he asked me if I saw any reason why I shouldn't have made that turn on to 14th street. My response was "no, in fact, I think I've done it a number of times." So he grabs my DL, registration and proof of insurance and walks back to the car. I'm thinking what in the blazes is going on!!
he comes back and explained to me that he has to give me the ticket and that it's considered a moving violation that is a $200 fine and a point off my liscense. I'm thinking holy hell, my driving record for the last 25 years has been spotless. He then pulls out his phone and tells me to go back to the intersection and take pictures of 2 signs that are very misleading. One of which was a no U turn sign and under the red "do not" part, the arrow of the "no left turn" part was obscuring and covering! The other sign was showing the ability to take a left turn but underneath it described it as having the ability to take that left turn, get this, on the next street!!!
The officer helped me out in a huge way and pictures and a written description helped me not only in keeping my driving record in good shape but saved me money in not paying the fine or possible increased insurance!!