A.
Major and collector streets. New subdivisions shall make provisions
for the continuation of major and collector streets.
B.
Lot access. Subdividing of land for residential use shall be such
as to provide that each lot shall front on an existing or proposed
public way.
C.
Street intersections. Intersections of streets shall be as nearly
at right angles as possible. No street shall intersect any other street
at less than 60°.
D.
Lengths and widths of blocks. In general, block lengths shall be
not less than 400 feet nor more than 1,200 feet; blocks shall be of
sufficient widths to accommodate two tiers of lots. The subdivider
may be required to construct and dedicate a pedestrian crosswalk in
blocks over 750 feet long.
E.
Half streets. "Half streets" based on the expectation of the other
1/2 of the street being developed at the time adjoining property is
subdivided are not normally acceptable as good land platting practice.
F.
Reserve strips. "Reserve strips" created by the platting of property
line streets several feet inside the property line with the objective
the receiving of remuneration for access to an improved street will
not be allowed.
G.
Reverse frontage. "Reverse frontage" or "double frontage" lots where
both the front and back of a lot will face a principal street will
not be allowed except in situations where one of the streets is a
major highway on which the fronting of local properties would not
be desirable.
H.
Buffer treatment. Where a proposed subdivision contains an existing
or proposed major street or abuts such a street or land use which
may have an adverse effect on the residential subdivision, the Plan
Commission may require some buffer treatment such as frontage streets,
reverse frontage with screen planting along rear lot lines, deep lots
or any other such treatment which may protect the proposed residential
subdivision from these outside influences.
I.
Lot lines. Lot lines shall be substantially at right angles or radial
to street lines.
J.
Corner lots. Corner lots for residential use shall have extra width
to permit appropriate building setback from both streets.
A.
Minimum standards for street design.
|
Major Street
|
Collector Street
|
Local Street
|
(Frontage) Marginal Access Street
|
Cul-De-Sac and Short Streets
| |
|---|---|---|---|---|---|
|
Right-of-way width
|
100 feet
|
80 feet
|
60 feet
|
60 feet
|
60 feet and 120 feet diameter
|
|
Pavement width* (back to back of curb)
|
Determined by traffic count in accordance with DOT standards
|
44 feet
|
28 feet
|
28 feet
|
28 feet and 100 feet diameter
|
|
Minimum radius of horizontal curves (road center line dimension)
|
475 feet (12°)
|
300 feet (19°)
|
200 feet (28°)
|
200 feet (28°)
|
100 feet (58°)
|
|
Minimum length of vertical curves
|
The profile grades for major streets shall be connected by vertical
curves of a minimum length equivalent to at least 20 times the algebraic
difference between the rates of grade, expressed in feet per hundred;
for secondary and minor streets, at least 15 times.
| ||||
|
Minimum tangents between reverse curves (road center line dimensions)
|
100 feet
|
100 feet
|
50 feet
|
50 feet
|
50 feet
|
|
Maximum gradient
|
5%
|
6%
|
8%
|
8%
|
8%
|
|
Minimum gradient
|
0.5%
|
0.5%
|
0.5%
|
0.5%
|
0.5%
|
|
Minimum clearance (vertical)
|
500 feet
|
300 feet
|
200 feet
|
200 feet
|
100 feet
|
|
Sight distance (horizontal)
|
500 feet
|
300 feet
|
100 feet
|
100 feet
|
100 feet
|
|
Minimum curb tangents at street intersections
|
52 feet
|
30 feet
|
30 feet
|
30 feet
|
30 feet
|
|
Sidewalks**
|
5 feet
|
5 feet
|
4 feet
|
4 feet
|
4 feet
|
|
*
|
See typical street sections for pavement details.
|
|
**
|
Optional or as directed by Village.
|
B.
Corners. Property lines at street intersections shall be rounded
with a radius of 25 feet. The Plan Commission may permit, as a suitable
equivalent, the use of comparable cutoffs or chords in place of such
rounded corners.
C.
Intersection of streets. Intersection of more than two streets at
a point will be prohibited. Street intersections shall be as nearly
at right angles as possible, and no intersection shall be at an angle
of less than 60°.
D.
Obstructions. There shall be no obstruction of any type to visibility
at street intersections within the right triangle formed by the center
of the intersection and two points 75 feet distant, each point being
on the center line of a fronting street.
E.
Street lines. Street lines deflecting from each other at any one
point shall be joined by a curve having a center line radius conforming
to the minimum standards, as stated herein.
F.
Reverse curves. A tangent portion of street shall be introduced between
reverse curves on all streets; said length shall conform to the minimum
standards, as stated herein.
G.
Cul-de-sac or dead-end streets. Cul-de-sac or dead-end streets, designed
to be so permanently, shall be not longer than 800 feet and shall
provide at the closed end a right-of-way and pavement equivalent to
the minimum requirements of these standards, as stated herein. No
cul-de-sac may intersect with another cul-de-sac.
H.
Utility easements. Utility easements across lots or centered on rear
or side lot lines shall be provided and not less than 10 feet in width.
I.
Stormwater easements. Where a subdivision is traversed by a watercourse,
there shall be provided a stormwater easement conforming substantially
with the lines of such watercourse and approved as to alignment and
width by the Village Engineer.
J.
Entrances. Whenever feasible, provision shall be made for two entrances
to the subdivision.
K.
Street jogs. Street jogs with center-line offsets of less than 150
feet shall not be allowed.
L.
Crosswalks. When blocks exceed 750 feet in length, a crosswalk easement
of 10 feet in width and a sidewalk of five feet in width shall be
provided to assure proper access.
