The chief of police or other chief law enforcement officer of a municipality shall have the right to position school crossing guards on any street or highway within the municipality; provided, however, that such guards may be stationed only when it is necessary to control or direct vehicular or pedestrian traffic during those time periods of a school day when it is necessary to control traffic or during any special event or program involving pedestrian crossings whenever it is deemed to be in the best interests of public safety.
N.J.S. § 40A:9-154.4