It is unlawful for any person to operate a motor vehicle in an inattentive manner over the highways of this city. For the purpose of this section, “inattentive” means the operation of a vehicle upon the public highways of this city in a lax or slack manner. The offense of operating a motor vehicle in an inattentive manner shall be considered to be a lesser offense than but included in the offense of operating a vehicle in a negligent manner. Any person violating the provisions of this section is guilty of a traffic infraction. (Ord. 2922 § 25, 1980; 1961 code § 11.48.110.)