Minimum speed rules for slow drivers

(a) The driver of a slow-moving vehicle shall drive the same as close as possible to the right-hand edge of any roadway, laned or unlaned for traffic. (b) The driver, further, may not drive a motor vehicle at such a low speed as to impede or block the normal and reasonable movement of traffic, except when so directed by a police officer or any other persons authorized to direct, control, or regulate traffic, or when reduced speed is necessary for safe operation, or compliance with the law. (c) Whenever any roadway is clearly marked for two or more lanes of traffic moving in the same direction, a person driving a motor vehicle in the lane or lanes other than the extreme right lane may not travel at a speed that is 5 miles per hour or more below the maximum stated speed, e.g., below 30 miles per hour in a 35-mile-per-hour speed limit zone or below 40 miles per hour in a 45-mile-per-hour speed limit zone, except when otherwise directed by a police officer or any other persons authorized to direct, control, or regulate traffic, or when a reduced speed is necessary for safe operation, or in compliance with the law. (d) On any street or highway or portions thereof on which parking is prohibited during the hours specified, during the morning peak traffic or afternoon peak traffic hours, or both, a person may not drive, move, or tow, nor may a registered owner knowingly cause or permit any person to drive, move, or tow, during those hours on the street or highway or portions thereof, any vehicle that cannot maintain a speed equal to the maximum stated speed, less 5 miles per hour, for the street or highway or portions thereof; provided that the foregoing provisions have no force and effect on public holidays as defined in § 15-2.19 . )