You have asked many questions about how to fight a traffic ticket. I would suggest that you speak with a traffic ticket attorney about how to proceed.
You are entitled to subpoena records from the citing agency. If you set a court date before the trial date you can request the documents be produced for that date. That will allow you to review them before the hearing. Interrogatories are only available in civil cases. The same law that applies to a misdemeanor or felony applies to a traffic. You can serve a discovery request on the District Attorney's office or subpoena the agency. The DA's office may or may not be involved in the handling of tickets in Sacramento.