Minnesota Administrative Rules
Agency 175 - Transportation Department
Chapter 8820 - LOCAL STATE-AID ROUTE STANDARDS, FINANCING
EXHIBITS, FIGURES, AND TABLES
Part 8820.9946 - MINIMUM DESIGN STANDARDS, URBAN; RECONDITIONING PROJECTS
Current through Register Vol. 49, No. 13, September 23, 2024
Subpart 1. Two-way streets.
In the following design chart, total width is from face-to-face of curbs.
Reconditioning projects for two-way urban roadways must meet or exceed the minimum dimensions indicated in the chart.
| Number of Through Lanes, Functional Class, and Present Traffic Volume | Total Width with No Parking | Total Width with Parking on One Side | Total Width with Parking on Both Sides | Proposed Structural Design Strength |
| (feet) | (feet) | (feet) | (tons) | |
| 2-Lane Collector or Local with ADT < 10000 | 26 | 32 | 38 | (b) 9 |
| 4-Lane Collector or Local with ADT < 10000 | 44 | 52 | 60 | (b) 9 |
| 2-Lane Collector or Local with ADT >= 10000 or 2-Lane Arterial (a) | 26 | 32 | 42 | 9 |
| 4-Lane Collector or Local with ADT >= 10000 or 4-Lane Arterial | 44 | 54 | 64 | 9 |
| 6-Lane Collectors or Arterials | 66 | (c) | (c) | 9 |
Engineering judgment may be used to choose a lane-width or shoulder-width dimension other than the widths indicated in the chart for roadways. Factors to consider include safety, speed, population/land use, benefit/cost analysis, traffic mix, peak hourly traffic, farm equipment, environmental impacts, terrain limitations, bicycle traffic, pedestrian traffic, other nonmotorized uses, functional classification, or other factors. Widths less than those indicated in the chart require a variance in accordance with parts 8820.3300 and 8820.3400.
When a median is included in the design of the two-way roadway, a one-foot reaction distance to the median is required on either side of the median. Minimum median width is four feet.
For ADT less than 150, the widths of bridges to remain must be at least the sum of the lanes. For ADT greater than or equal to 150, the widths of bridges to remain must be at least the sum of the lanes plus half the sum of the shoulders, parking lane, and curb reaction distance.
Subp. 2. One-way streets.
In the following design chart, total width is from face-to-face of curbs.
Reconditioning projects for one-way urban roadways must meet or exceed the minimum dimensions indicated in the chart.
| Number of Through Lanes and Functional Class | Present ADT | Total Width with No Parking | Total Width with Parking on One Side | Total Width with Parking on Both Sides | Proposed Structural Design Strength |
| (feet) | (feet) | (feet) | (tons) | ||
| 2-Lane Collector or Local with ADT < 10000 | < 5000 | 21 | 29 | 37 | 7 |
| 5000-10000 | 23 | 31 | 39 | 9 | |
| 2-Lane Collector or Local with ADT >= 10000 or 2-lane Arterial | < 15000 | 23 | 31 | 39 | 9 |
| >= 15000 | 24 | 32 | 40 | 9 | |
| 3-Lane Arterial or Collector | All | 34 | 42 | 50 | 9 |
For ADT less than 150, the widths of bridges to remain must be at least the sum of the lanes. For ADT greater than or equal to 150, the widths of bridges to remain must be at least the sum of the lanes plus half the sum of the shoulders, parking lane, and curb reaction distance.
Subp. 3. Exception.
Any street that was previously built to state-aid or state standards, that was granted a variance to standards in effect at the time of construction or reconstruction, or that is a trunk highway turnback, but does not meet current standards, may be reconditioned regardless of subparts 1 and 2.
Statutory Authority: MS s 14.386; 14.389; 162.02; 162.09
