I verified the crossroad (based on address provided from you privately), I can see "no turn" sign on north bound A ave, including one before and one after E st. On south bound A Ave, I did not see any no turn sign near E st. at all.
I am not sure how comfortable you are with technology. But here is what I would do.
You can use cell phone camera to shoot a video footage of you walking both side of A Ave and noting the existing "no turn" sign, and the lack thereof on the other side.
Also make a video of your Google map streetview navigation on your PC, following this article http://www.howtogeek.com/205742/how-to-record-your-windows-mac-linux-android-or-ios-screen/
Load two videos on your phone, and bring it to the court. You probably have a chance.
