Design Standards and Improvement Specifications
Type of Concrete | Strength (pounds per square inch) |
|---|---|
Class A | 5,000 |
Class B | 4,500 |
Class C | 4,000 |
Class D | 3,500 |
Schedule of Street Design Standards | |||
|---|---|---|---|
Street Classification | |||
Local | Collector Streets | Arterial Highways | |
Normal traffic capacity (ADT) | 400 | 3,000 | 10,000 |
Minimum right-of-way width (feet) | 50 | 60 | 100 |
Minimum paving width (feet) | |||
Two-way | 32 | 40 | 60 |
One-way | 25 | — | — |
Shoulder (or parking area) Width (1) | — | — | 2 at 8 feet |
Sidewalks | |||
Width (feet) | 4 | 4 | 4 |
Setback, from face of curb (feet) | 3 | 3 | 4 |
Design speed (mph) (3) | 40 | 50 | 60 |
Minimum radius of horizontal curvature at center line (feet) | 150 | 500 | 2,000 |
Minimum tangent between reverse curbs (feet) | 100 | 200 | 600 (4) |
Maximum longitudinal grade | 8% | 8% | 4% |
Minimum longitudinal grade | |||
Desirable | 0.75% | 0.75% | 0.75% |
Absolute | 0.40% | 0.40% | 0.40% |
Maximum longitudinal grade for 200 feet from each side of an intersection | 3.5% | 3.00% | — |
Minimum curb return radius at intersection feet (2) | 15 | 25 | 45 |
Vertical curve (5) Crest: minimum length equals 100 feet—based on stopping sight distance at design speed | |||
Sag: minimum length equals 100 feet—based on headlight illumination and stopping sight distance at design speed | |||
Maximum superelevation not required | — | — | 6% |
Pavement cross slope minimum | 3.00%(7) | 3.33%(8) | 1.50%(8) |
Curb face required inches (6) | 6 | 8 | 8 |
Minimum property line corner radius feet (2) | 5 | 15 | 30 |
NOTES: |
(1) Shoulders or parking areas as may be required. |
(2) When dissimilar streets intersect, the larger radius will be used. |
(3) For sight distance and vertical curve calculation only. |
(4) As required to run out super elevation (1% per section of travel at design speed). |
(5) Not required if algebraic difference of intersecting grades does not exceed one. |
(6) Except in superelevation areas. |
(7) A six inch crown. |
(8) An eight inch crown. |
(9) The roadway widths outlined in various sections of this chapter which are applicable to specific uses shall apply. |
(10) In artery highways, an eight foot wide median strip shall be provided in the center of the roadway to separate traffic. |
Design Standards and Improvement Specifications
Type of Concrete | Strength (pounds per square inch) |
|---|---|
Class A | 5,000 |
Class B | 4,500 |
Class C | 4,000 |
Class D | 3,500 |
Schedule of Street Design Standards | |||
|---|---|---|---|
Street Classification | |||
Local | Collector Streets | Arterial Highways | |
Normal traffic capacity (ADT) | 400 | 3,000 | 10,000 |
Minimum right-of-way width (feet) | 50 | 60 | 100 |
Minimum paving width (feet) | |||
Two-way | 32 | 40 | 60 |
One-way | 25 | — | — |
Shoulder (or parking area) Width (1) | — | — | 2 at 8 feet |
Sidewalks | |||
Width (feet) | 4 | 4 | 4 |
Setback, from face of curb (feet) | 3 | 3 | 4 |
Design speed (mph) (3) | 40 | 50 | 60 |
Minimum radius of horizontal curvature at center line (feet) | 150 | 500 | 2,000 |
Minimum tangent between reverse curbs (feet) | 100 | 200 | 600 (4) |
Maximum longitudinal grade | 8% | 8% | 4% |
Minimum longitudinal grade | |||
Desirable | 0.75% | 0.75% | 0.75% |
Absolute | 0.40% | 0.40% | 0.40% |
Maximum longitudinal grade for 200 feet from each side of an intersection | 3.5% | 3.00% | — |
Minimum curb return radius at intersection feet (2) | 15 | 25 | 45 |
Vertical curve (5) Crest: minimum length equals 100 feet—based on stopping sight distance at design speed | |||
Sag: minimum length equals 100 feet—based on headlight illumination and stopping sight distance at design speed | |||
Maximum superelevation not required | — | — | 6% |
Pavement cross slope minimum | 3.00%(7) | 3.33%(8) | 1.50%(8) |
Curb face required inches (6) | 6 | 8 | 8 |
Minimum property line corner radius feet (2) | 5 | 15 | 30 |
NOTES: |
(1) Shoulders or parking areas as may be required. |
(2) When dissimilar streets intersect, the larger radius will be used. |
(3) For sight distance and vertical curve calculation only. |
(4) As required to run out super elevation (1% per section of travel at design speed). |
(5) Not required if algebraic difference of intersecting grades does not exceed one. |
(6) Except in superelevation areas. |
(7) A six inch crown. |
(8) An eight inch crown. |
(9) The roadway widths outlined in various sections of this chapter which are applicable to specific uses shall apply. |
(10) In artery highways, an eight foot wide median strip shall be provided in the center of the roadway to separate traffic. |