321.277  Reckless driving.

Any person who drives any vehicle in such manner as to indicate either a willful or a wanton disregard for the safety of persons or property is guilty of reckless driving.

Every person convicted of reckless driving shall be guilty of a simple misdemeanor.

321.285  Speed restrictions.

Any person driving a motor vehicle on a highway shall drive the same at a careful and prudent speed not greater than nor less than is reasonable and proper, having due regard to the traffic, surface, and width of the highway and of any other conditions then existing, and no person shall drive any vehicle upon a highway at a speed greater than will permit the person to bring it to a stop within the assured clear distance ahead, such driver having the right to assume, however, that all persons using said highway will observe the law.

The following shall be the lawful speed except as provided by this section, or except as posted pursuant to sections 262.68, 321.236, subsection 5, section 321.288, subsection 6, sections 321.289, 321.290, 321.293, 321.295, and 461A.36, and any speed in excess thereof shall be unlawful:

1.  Twenty miles per hour in any business district.

2.  Twenty-five miles per hour in any residence or school district.

3.  Forty-five miles per hour in any suburban district. Each school district as defined in subsection 70 of section 321.1 shall be marked by distinctive signs as provided by the current manual of uniform traffic control devices adopted by the department and placed on the highway at the limits of such school district.

4.  Notwithstanding any other speed restrictions, the speed limit for all vehicular traffic shall be fifty-five miles per hour.

5.  Reasonable and proper, but not greater than fifty-five miles per hour at any time between sunrise and sunset, and not greater than fifty miles per hour at any time between sunset and sunrise, on secondary roads unless such roads are surfaced with concrete or asphalt or a combination of both, in which case the speed limits shall be the same as provided in subsection 4 of this section. When the board of supervisors of any county shall determine upon the basis of an engineering and traffic investigation that the speed limit on any secondary road is greater than is reasonable and proper under the conditions found to exist at any intersection or other place or upon any part of a secondary road, the board shall determine and declare a reasonable and proper speed limit at the intersection or other part of the secondary road. The speed limits as determined by the board of supervisors shall be effective when appropriate signs giving notice of the speed limits are erected by the board of supervisors at the intersection or other place or part of the highway.

6.  Notwithstanding any other speed restrictions, the speed limit for all vehicular traffic on fully controlled-access, divided, multilaned highways including the national system of interstate highways is sixty-five miles per hour. The department may establish a speed limit of sixty-five miles per hour on certain divided, multilaned highways. However, the department or cities with the approval of the department may establish a lower speed limit upon such highways located within the corporate limits of a city. For the purposes of this subsection, a fully controlled-access highway is a highway that gives preference to through traffic by providing access connections with selected public roads only and by prohibiting crossings at grade or direct private driveway connections. A minimum speed may be established by the department on the highways referred to in this subsection if warranted by engineering and traffic investigations.

It is further provided that any kind of vehicle, implement, or conveyance incapable of attaining and maintaining a speed of forty miles per hour shall be prohibited from using the interstate system.

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