The officer shall deliver one copy of the notice to appear to the arrested person, as provided in Section 853.6(d) of the California Penal Code, and the arrested person in order to secure release must give his written promise so to appear in court by signing the duplicate notice, which shall be retained by the officer. Thereupon the arresting officer shall forthwith release the person arrested from custody. (Ord. 270 § 2, 1966)