The following principles, standards and requirements will be
applied by the City Council and Planning Commission to evaluating
plans for proposed subdivision or land developments. The standards
and requirements outlined herein shall be considered minimum standards
and requirements for the promotion of the public health, safety, morals
and general welfare. Where literal compliance with the standards herein
specified is clearly impractical, the City Council may modify or adjust
the standards to permit reasonable utilization of property while securing
substantial conformance with the objectives of this chapter.
[Amended 5-10-1999 by Ord. No. 1598]
A. Street classification. Three functional classifications are hereby
established for the streets and roads in the City:
(1) Arterial. This classification includes highways which provide intra-county
or intermunicipal traffic of substantial volumes where the average
trip lengths are usually five miles or greater. Generally, these highways
should accommodate operating speeds of 35 to 55 miles per hour.
(2) Collector. This classification is intended to include those highways
which connect local access highways to arterial highways. They may
serve intra-county and intermunicipal traffic. They may serve as traffic
corridors connecting residential areas with industrial, shopping and
other service. They may penetrate residential areas. Generally, these
highways will accommodate operating speeds of 35 miles per hour.
(3) Local access. This classification is intended to include streets
and roads that provide direct access to abutting land and connections
to higher classes of roadways. Traffic volumes will be low and travel
distances generally short. These streets and roads should be designed
for operating speeds of 25 miles per hour or under.
B. Right-of-way widths.
(1) Minimum widths for each type of public street shall be as follows:
Type of Street
|
Right-of-Way Width
(feet)
|
Cartway Width
(feet)
|
---|
Arterial
|
80 to 120
|
46
|
Collector
|
60
|
34
|
Local access
|
50
|
24
|
(2) Where a proposed subdivision abuts or contains an existing public
street or road having a right-of-way width less than would be required
if said street or road were created under this chapter, sufficient
additional width for right-of-way shall be provided and dedicated
to meet the foregoing standards. Additional right-of-way and cartway
widths may be required by the City Council to promote public safety
and convenience when special conditions require it and to provide
parking space in areas of intensive use.
C. Culs-de-sac.
(1) Culs-de-sac, whether permanent or temporary, shall be provided at
the closed end with a turnaround having a minimum radius to the edge
of the finished street or curbline of not less than 50 feet.
(2) Unless future extension is clearly impractical or undesirable, the
turnaround right-of-way shall be placed adjacent to a property line,
and a right-of-way of the same width as the street shall be carried
to the property line in such a way as to permit future extension of
the street into the adjoining tract. At such time as such a street
is extended, the overage created by the turnaround outside the boundaries
of the extended street shall revert in ownership to the property owners
fronting on the turnaround of the cul-de-sac.
(3) Commercial and industrial culs-de-sac shall be reviewed for adequacy
by the City Engineer. His recommendations will be given to the City
Council, who shall have final authority in this matter.
(4) Permanent culs-de-sac shall be kept to a minimum and shall not exceed
600 feet in length.
D. Street alignment.
(1) Whenever street lines are deflected by more than 5°, connection
shall be made by horizontal curves.
(2) The minimum radius at the center line for horizontal curves on collector
and arterial streets shall be 300 feet, and for local streets the
minimum radius shall be 100 feet.
(3) On local access streets, the minimum tangent between reverse curves
shall be at least 100 feet; on collector and arterial streets, the
minimum tangent shall be at least 250 feet.
(4) Minimum vertical sight distance measured four feet above grade shall
be 300 feet for collector and arterial streets and 100 feet for local
access streets.
E. Street grades.
(1) The minimum grade on all streets shall be 1/2%.
(2) The maximum grade on collector or arterial streets shall be 7% and
on local access streets 10%.
(3) Vertical curves shall be used in changes of grade exceeding 1% and
shall provide proper sight distances as specified hereinabove.
F. Street intersections.
(1) Local streets shall not intersect with collector or arterial streets
on the same side at intervals of less than 800 feet as measured from
center line to center line.
(2) The distance between center lines of streets opening onto the opposite
side of a proposed or existing street shall be not less than 150 feet
unless the streets are directly opposite each other.
(3) Multiple intersections involving the junction of more than two streets
shall be avoided. Where this proves impossible, such intersections
shall be designed with extreme care for both pedestrian and vehicular
safety.
(4) Streets shall be all laid out to intersect as nearly as possible
at right angles. Local streets shall not intersect collector or arterial
streets at an angle of less than 75°. The intersection of two
local streets shall not be at an angle of less than 60°.
(5) Minimum curb radius at the intersection of two local streets shall
be at least 20 feet, and minimum curve radius at an intersection of
a local street and a collector or arterial street shall be at least
25 feet.
(6) There shall be provided and maintained at all intersections clear
sight triangles of 75 feet in all directions measured along the center
line from the point of intersection. Nothing which obstructs the vision
of a motorist shall be permitted in this area.
(7) Intersections shall be designed with a flat grade wherever practical.
Where the grade of any street at the approach to an intersection exceeds
7%, a leveling area shall be provided having a grade of not greater
than 4% for a distance of 25 feet measured from the nearest right-of-way
line of the intersecting street.
G. Pavement design.
(1) All components of the pavement structure shall be designed and constructed
in accordance with Pennsylvania Department of Transportation Specifications,
Form 408.
(2) Minimum requirements. The following shall be considered to be minimum
standards for street construction in the City:
Alternates
|
Type
|
Local Access Streets
(inches)
|
Collector and Arterial Streets
(inches)
|
---|
Rigid pavement
|
Plain cement concrete subbase
|
6
|
6
|
Flexible pavements
|
|
|
|
|
Surface
|
ID-2
|
1 1/2
|
1
|
|
Base
|
Bituminous
|
4
|
6
|
|
Subbase
|
|
6 (if req.)
|
6 (if req.)
|
|
Surface
|
ID-2
|
3
|
3
|
|
Base
|
Crushed aggregate (regular or dense grade)
|
6
|
10
|
|
Subbase
|
|
6 (if req.)
|
9 (if req.)
|
|
Surface
|
ID-2
|
3
|
3
|
|
Base
|
Modified stone aggregate
|
8
|
10
|
|
Subbase
|
|
6 (if req.)
|
9 (if req.)
|
H. Alleys and driveways.
(1) Alleys are prohibited in residential developments.
(2) Driveways serving properties located adjacent to an intersection
shall be offset from the intersection of the curbline a distance not
less than the required setback dimension.