There are no juries in a traffic ticket trial. A judge or commissioner (an official who works for the court) decides if you're guilty or not.If you are contacted, please call the Jury Commissioner's office at 925-608-1000. Videos. Answering the Call for Jury Service. Traffic Window: Monday-Friday, 8-4pm. If you have a court appearance for drunk driving, domestic violence, or other charges in Contra Costa County, you can find out more about what to expect below. You will be required to make only one appearance in court for jury selections held that day, or serve for one trial (jury selection may take more than one day). Simply visit njmcdirect. Com and enter your ticket information to see if your offense is eligible, and select the option for Case Dispute. Find the best traffic tickets attorney serving Contra Costa County.