A traverse juror is a member of a jury that listens to evidence presented by both sides in a trial and determines the facts of the case. Traverse juries are generally composed of 12 people and are impaneled to try a criminal or civil case. The term "traverse" refers to the process of going across or through something, in this case, the evidence presented by both sides in a trial. Traverse jurors usually serve for a week or more, depending on the length of the trial.