The license plates, required on every motor vehicle by laws of the State of Nebraska, or by laws of any other state while the vehicle is operated within the corporate limits, shall be kept clear and free from grease, dust, or other blurring matter so they will be plainly visible at all times, and shall be attached in such manner as to be clearly readable at a distance of 100 feet and under no circumstances shall they be obstructed by any portion of the vehicle.
(Neb. RS 60-324 and 60-325) (1972 Code, § 5-303) Penalty, see § 70.99