§ 22-410. Street Alignment.

Sight distance, horizontal and vertical curvature, super elevation and maximum and minimum street grades shall be determined by the Borough Engineer in compliance with the standards contained in A Policy on Geometric Design of Highways and Streets, published by the American Association of State Highway Transportation Officials (AASHTO), most recent edition, or PennDOT standards, whichever is more restrictive. In addition, the following standards and guidelines shall be complied with:

1. 

Whenever street lines are deflected in excess of 5°, connection shall be made by horizontal curves.

2. 

To ensure adequate sight distance, minimum center-line radii for horizontal curves shall be according to AASHTO standards related to design speed. In any event, the following minimum radii shall be met:

A. 

On local public access roads and as established by proper engineering practices for private local access roads: 200 feet.

B. 

On collector roads: 300 feet.

C. 

On arterial roads: 500 feet.

D. 

PennDOT standards shall be applied to expressways.

3. 

A tangent of at least 100 feet shall be introduced between all horizontal curves on collector and arterial roads.

4. 

Super elevation shall be required on arterial roads where the curve radius is less than 600 feet.

5. 

Minimum curve radius shall not be permitted on maximum grade.

6. 

Street grades shall be measured along the center line in accordance with the following:

A. 

Center-line grades shall not be less than 1%.

B. 

Center-line grades shall not exceed 6% on arterial and collector streets or 10% on local access streets. PennDOT standards for grade shall be applied to expressways.

C. 

At all changes of street grades where the algebraic difference exceeds 1%, vertical curves shall be provided to permit a minimum sight distance related to design speed as specified by AASHTO standards; in any event, a minimum sight distance of 200 feet along local access streets, 300 feet along collector streets and 500 feet along arterials. PennDOT standards for sight distance shall be applied to expressways.

D. 

Street grades at intersections shall, in general, be less than 4% on all approaches measured within 75 feet of the intersection of right-of-way lines.

E. 

The slope ratio of banks shall not be less than four to one horizontal to vertical (4:1).

Ord. 2016-2267, 10/11/2016