Well, I am not sure if this helps. I have a few tickets dismissed (3 in total) over the last 8 years. What happen is that every time I go to court and ask for trial by declaration.
The first tickets was a speeding ticket. What I did was using the location of the ticket issued, the distance that I had traveled from a light (where I took the right turn into the street that I was ticketed), using the published 0-60 number from manufacturer, and citing the physics books from college and figure out the maximum speed that I could be traveling at that moment where the cop gave me the ticket. I cited over 10 text and publications, including CalTran maps. I won and got my money back.
The second ticket was a illegal left turn into a parking lot, (the new plaza off Grand and Valley, right next to the CHP office) it was a entrapment all the way. There were two bike CHP directing one car after another for ticket. (There were some construction so they change the sign into no left turn). I again used trial by declaration. I took photos of the new sign, which is way after the entrance of the left turn. I argued on the ground of, 1, unclear sign. 2, entrapment. 3, random prosecution, because the cop did not stop everyone, as they were either writing tickets, or didn't want to go after anyone just drive away. I argued that you can't presecute some and not others without cause. Again, I won, and got my bail amount back.
The last one is another speeding ticket, happen on Azusa southbound before Amar. Again, it was contruction time and the speed limit was changed, and again was by bike CHP. I used trial by declaration again. I took picture of all the cones that was not in service, which clearly means there wasn't a construction going on. Also, I took pictures of the downed signs to proof that it wasn't enforced at the time.
I guess the moral of the story is to use trial by declaration, because once you do that, the cop also have to do some homework too, which I believe they do not like to on their spare time. In addition, remember to cite many credible sources, and impress the judge that you did your homework and you feel that you are not guilty of the infaction.
Anyway, I hope this helps...