32-25-5. Minimum speed on interstate highways--Violation--Exceptions.

It is a Class 2 misdemeanor at any time for a person to drive or operate a motor vehicle upon the national system of interstate highways at a speed less than forty miles per hour unless the vehicle is operated pursuant to a permit, issued by the Department of Public Safety. This section does not apply to highway equipment operated by personnel in the performance of highway maintenance duties.

Source: SDC Supp 1960, § 44.0303 (8) as added by SL 1963, ch 253; SL 1964, ch 123, § 1; SL 1989, ch 255, § 125; SL 2022, ch 100, § 1.

32-25-5.1. Unreasonably slow speed prohibited--Violation as misdemeanor.

No person may drive a motor vehicle at such a slow speed as to impede the normal and reasonable movement of traffic except when reduced speed is necessary for safe operation or in compliance with law. A violation of this section is a Class 2 misdemeanor.

Source: SL 1970, ch 175, § 14, § 1; SL 1989, ch 255, § 126.

32-25-5.2. Posting of minimum speeds on particular highways--Violation of minimum speeds as misdemeanor.

If the transportation commission within its respective jurisdiction determines on the basis of an engineering and traffic investigation that slow speeds on any part of a highway consistently impede the normal and reasonable movement of traffic, the commission may adopt rules setting minimum speed limits below which no person may drive a vehicle except when necessary for safe operation or in compliance with law. A violation of such minimum speed limits is a Class 2 misdemeanor.

Source: SL 1970, ch 175, § 14, § 2; SL 1989, ch 255, § 127.