Office of Traffic and Safety

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Access management

(excerpt from policy guidebook)

Entrance spacings (page 5 and 6)

112.2(21) Predetermined access location. A location of access reserved for the adjacent property at the time access rights are acquired.

112.2(22) Primary road or primary highway. A road or street designated as a "primary road" in accordance with Iowa Code subsection 306.3(6). This definition includes primary road extensions in cities and primary roads under construction.

112.2(23) Priority I highway. A primary highway constructed as a fully controlled access highway. Permanent access to the facility is allowed only at interchange locations. No permanent at-grade access is allowed.

112.2(24) Priority II highway. A primary highway constructed as a two-lane or multilane (more than two lanes) facility with a high degree of access control. Access to the facility is allowed only at interchanges and selected at-grade locations. The minimum allowable spacing between access locations is one-half mile. Limiting primary highway access to existing public road intersections at intervals of one mile is preferable.

112.2(25) Priority III highway. A primary highway constructed as a two-lane or multilane facility. Access to the facility is allowed at interchanges and at-grade locations. The minimum allowable spacing between access locations is 1000 feet. Spacing of one-quarter mile is preferable.

112.2(26) Priority IV highway. A primary highway constructed as a two-lane facility; however, the definition may include a multilane facility. Priority IV is divided into Priority IV(a) and Priority IV(b). 1. For highways designated as Priority IV(a), the minimum allowable spacing between access locations is 600 feet. 2. For highways designated as Priority IV(b), the minimum allowable spacing between access -6- locations is 300 feet.

112.2(27) Priority V highway. A primary highway where access rights to it were acquired between 1956 and 1966, entrances were reserved at that time with no spacing limitations, and the department has subsequently determined that a higher degree of access control is desirable. The definition also includes a highway where access rights have not been acquired, but the department anticipates acquiring access rights in the future.
In rural areas, entrances to the highway are generally restricted to one entrance for contiguous highway frontage not exceeding 1,000 feet, two entrances for contiguous highway frontage exceeding 1,000 feet but not exceeding 2,000 feet, and so on.

112.2(28) Priority VI highway. A primary highway where the acquisition of access rights or additional access rights is not anticipated. This definition may also include a highway where access rights were acquired between 1956 and 1966, entrances were reserved at that time with no spacing limitations, and the department has subsequently determined that restricting access to the facility is no longer necessary.

Access locations are approved based on safety and need.

Access policy guidebook

Access Policy PDF