It is unlawful for any person to obstruct a street or sidewalk of the city by intentionally or in a criminally negligent manner placing anything, or performing any act, on any sidewalk, road, street, or public way which will render movement thereon more difficult or which will interfere with the free and uninterrupted use of the street or sidewalk.
(`83 Code, § 10-301) Penalty, see § 10.99