S.D. Admin. R. tit. 70, art. 70:09, ch. 70:09:02, app A
South Dakota Access-Location Criteria
Access Class | Signal Spacing Distance (mile) | Median Opening Spacing (mile) | Minimum Unsignalized Access Spacing (feet) | Access Density | Denial of Direct Access When Other Available | ||
Interstate | N/A | N/A | N/A | N/A | Yes | ||
Expressway | 1/2 | 1/2 | 2640 | at half-mile increments | Yes | ||
Free Flow Urban | 1/2 | 1/2 F, 1/4 D | 1320 | at quarter-mile increments | Yes | ||
Intermediate Urban | 1/2 | 1/2 F, 1/4 D | 660 | at eighth-mile increments | Yes | ||
Urban Developed | 1/4 | 1/4 | 100 | 2 accesses/block face | Yes | ||
Urban Fringe | 1/4 | 1/2 F, 1/4 D | 1000 | 5 accesses/side/mile | Yes | ||
Rural | N/A | N/A | 1000 | 5 accesses/side/mile | Yes | ||
NOTES: | |||||||
1. | Access to the Interstate system is governed by SDDOT interchange policy. No new | ||||||
access shall be provided on non-interstate routes within 1/8 mile of interstate ramp | |||||||
terminals. | |||||||
2. | N/A = Not Applicable, F = Full Movement all turns and through movements | ||||||
provided, D = Directional Only certain turning and through movements not | |||||||
provided. | |||||||
3. | SDDOT may defer to stricter local standards. | ||||||
4. | SDDOT will seek opportunities to reduce access density wherever possible. | ||||||
5. | Rural class minimum unsignalized access spacing may be reduced to 660' by the | ||||||
Area Engineer, based on results of an engineering study as described in § 70:09:02:01. | |||||||
Access Class Definitions
Interstate the designated Interstate highway system, including I-90, I-29, I-229, and I-190.
Expressway high-speed divided highways serving interstate and regional travel needs.
Free Flow Urban higher speed facilities with access subordinate to through traffic movement.
Intermediate Urban serves through traffic while allowing moderate access density.
Urban Developed traffic artery with high access density. Access and through movement have equal priority.
Urban Fringe rural highway serving developing area immediately adjacent to a city or town. Access regulated to provide future through-traffic priority.
Rural low volume, high-speed facility. Access points are spaced for safety and operations efficiency.
S.D. Admin. R. tit. 70, art. 70:09, ch. 70:09:02, app A