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A. Where the deflection angle of two road tangents exceeds 10 degrees, a horizontal circular curve is required, the centerline radius of which shall not be less than as outlined below:

1. Local 1 and pioneer access roads, 125 feet;

2. Local 2 roads, 205 feet;

3. Minor collector road, 300 feet;

4. Switchbacks. Switchbacks shall be connected with at least a 50-foot radius curve, and the curve shall have a maximum grade of two percent. Switchbacks will be allowed on local roads and pioneer access roads only;

5. Single curves shall be separated by a 220-foot minimum tangent length for collector and frontage road classifications.

B. Gradients.

1. The maximum permitted road grade for straight sections of local, pioneer, and collector roads shall be 10 percent.

2. The maximum centerline grade for horizontal curves within 25 percent of the minimum radius shall be seven percent with superelevation determined by AASHTO/ITE guidelines.

3. Permanent and temporary turnaround areas shall not exceed four percent.

4. For collector and frontage roads, all changes in road grades shall be connected by vertical curves of a minimum length equivalent to 30 times the algebraic difference in the grade percents.

5. For all other roads, the vertical curve length shall be one-half this minimum.

C. Intersections.

1. Streets shall intersect at an angle as close to 90 degrees as feasible, and in no event, at an angle less than 60 degrees.

2. In classifications other than pioneer access roads, corner roundings with a minimum 20-foot radius shall be required at intersections, except the creation of corner roundings shall not be required by platting action that otherwise would require no other right-of-way dedication if the Borough engineer and, if existing, a managing public agency of the roadway(s) find the following:

a. The existing rights-of-way provide sufficient area for the existing road improvements; and

b. The existing rights-of-way provide sufficient area for planned future road improvements.

3. No more than two roads shall intersect at one point.

4. The distance between intersection centerlines shall not be less than 200 feet.

5. For intersections with collectors and frontage roads, intersecting roads shall have no horizontal curves within 100 feet of an intersection.

6. For intersections of all other roads, no horizontal curves shall be within 50 feet of an intersection.

7. Within 100 feet of the shoulder of the through road at an intersection, the intersecting road shall have a grade not exceeding four percent.

a. The through road shall have a grade not exceeding six percent 75-foot each side of the intersection.

D. Sight Distances. The following minimum sight distances, including horizontal and vertical conditions, shall apply both to intersections and along road centerlines:

Minimum Road Design Standards

Road Geometrics and Profiles

Road Classification

Minimum Curve Radius

Minimum Sight Distance

Design Speed

New Option

Local 1

125

125

20 mph

Local 2

205

205

25 mph

Minor collector

300

300

30 mph

Major collector

*

*

45 mph

Arterial

*

*

55 mph

Frontage road

300

300

30 mph

Alley

125

125

20 mph

Pioneer access road

125

125

20 mph

*Determined by AASHTO/ITE standards.

(Ord. 2015-45 §§ 4, 5, 2015; Ord. 2015-15 § 2, 2015; Ord. 2005-33 § 12, 2006; Ord. 2005-10 § 2, 2005.)