Whenever the proposed subdivision contains or is adjacent to
a limited-access highway right-of-way, the design shall provide the
following treatment:
A. Landscape buffer yard easement required. When lots within the proposed subdivision, certified survey map, or condominium back upon the right-of-way of an existing or proposed limited-access arterial street or highway, a planting strip (landscape buffer yard easement) a minimum 35 feet in depth (width), or as otherwise required by Chapter
500, Zoning, shall be provided adjacent to the highway or railroad in addition to the normal lot depth. This strip shall be a part of the platted lots but shall have the following restriction lettered on the face of the plat: "Landscape Buffer Yard Easement: This strip is reserved for the planting of trees and shrubs; the building of structures hereon is prohibited."
B. Streets serving commercial and industrial properties. Commercial
and industrial properties shall have provided, on each side of the
limited-access highway, streets approximately parallel to and at a
suitable distance from such highway or railroad for the appropriate
use of the land between such streets and highway or railroad, but
not less than 150 feet.
C. Streets parallel to a limited-access highway right-of-way. Streets
parallel to a limited-access highway right-of-way, when intersecting
a major street and highway or collector street which crosses said
highway, shall be located at a minimum distance of 250 feet from said
highway right-of-way. Such distance, where desirable and practicable,
shall be determined with due consideration of the minimum distance
required for the future separation of grades by means of appropriate
approach gradients.
D. Minor streets adjacent and parallel to arterial streets and highways.
Minor streets immediately adjacent and parallel to arterial streets
and highways shall be avoided in residential areas.
The minimum right-of-way and roadway width of all proposed streets
and alleys shall be as specified by the county development or Town
Comprehensive Plan, plan component, Official Map, neighborhood development
study, or jurisdictional highway system plan of the county or local
municipality; or if no width is specified therein, the minimum widths
shall be as shown in Table 1. Street sections are for standard arterial
streets only. Cross-sections for freeways, expressways, and parkways
should be based upon detailed engineering studies. In addition:
A. Maximum cul-de-sac street length. Cul-de-sac streets designed to
have one end permanently closed shall not exceed:
(1) Seven hundred fifty feet in length in areas serving lots less than
two acres in area and the total potential average daily traffic (ADT)
is less than 250.
(2) One thousand feet in length in rural areas where lots are greater
than two acres in area and the total potential average daily traffic
(ADT) is less than 100.
Table 1
Minimum Dimensional Design Standards for Urban and Rural
Streets and Other Public Ways
|
---|
Type of Street or Other Public Way
|
Required Minimum Section in Urban Areas (a)
|
Required Minimum Section in Rural Areas (a)
|
---|
Width of Dedicated Right-of-Way
(feet)
|
Dimensions of Section Components
(feet)
|
Width of Dedicated Right-of-Way
(feet)
|
Dimensions of Section Components
(feet)
|
---|
Arterial streets (4-lane)
|
130
|
Pavement = dual 36 (face of curb to face of curb)
Median = 26
Curb lawn = 10 per side
Sidewalk = 5
Outside sidewalk = 1
|
130
|
Pavement = dual 24
Median = 18
Shoulders = 10 outside, 6 inside
Roadside ditch = 16 per side
|
Arterial streets (2-lane rural to suburban to urban transitional)
|
130
|
Pavement = 24
Shoulder = 10 (paved)
(Note: The balance of the right-of-way is to accommodate future
improvements.)
|
100
|
Pavement = 24
Shoulder = 10 (paved)
(Note: The balance of the right-of-way is to accommodate future
improvements.)
|
Collector streets
|
80
|
Pavement = 40 (face of curb to face of curb)
Curb lawn = 14 per side
Sidewalk = 5 per side
Outside sidewalk = 1 per side
|
None
|
None
|
Minor streets (typical)
|
66
|
Pavement = 28 (face of curb to face of curb)
Curb lawn = 10 per side
Sidewalk = 5 per side
Outside sidewalk = 1 per side
|
66
|
Pavement = 24
Shoulders = 5 per side
Roadside ditch = 13 per side
|
Minor streets (natural resource protection option as determined
by Town Board)
|
50
|
Pavement = 28 (face of curb to face of curb)
Curb lawn = 11 per side
Sidewalk = none
|
50
|
Pavement = 22
Shoulders = 5 per side
Roadside ditch = 9 per side
|
Cul-de-sac (turnaround)
|
60 radius
|
Pavement = 45 radius (outside face of curb radius) and 24 (inside
pavement radius forming planting island in center of cul-de-sac)
Curb lawn = 15
Sidewalk = none required
|
60 radius
|
Pavement = 46 radius (outside face of curb radius) and 24 (inside
pavement radius forming planting island in center of cul-de-sac)
Shoulders = 6
Roadside ditches = 15
Sidewalk = none required
|
Alleys
|
25
|
Pavement = 20
Outside pavement = 25 per side
|
Not permitted
|
Not permitted
|
Bicycle paths
|
20(b)
|
Pavement = 10
Outside pavement = 5 per side
|
20(a)
|
Pavement = 10
Outside pavement = 5 per side
|
Pedestrian-ways
|
20(b)
|
Pavement = 5
Outside pavement = 7.5 per side
|
20(a)
|
Pavement = 5
Outside pavement = 7.5 per side
|
NOTES:
|
---|
(a)
|
See Article XV for definitions of "urban area" and "rural area."
|
(b)
|
An easement may be permitted by the Plan Commission rather than
a dedicated public right-of-way.
|
B. Temporary street termination. Temporary termination of streets intended
to be extended at a later date shall be accomplished with a temporary
cul-de-sac in accordance with the standards set forth above, or by
the construction of a temporary T-intersection 33 feet in width and
33 feet in length abutting the right-of-way lines of the access street
on each side.
C. Roadway elevations. Elevations of roadways passing through floodplain
areas shall be designed in the following manner:
(1) Freeways and arterial streets and highways shall be designed so they
will not be overtopped by the one-hundred-year recurrence interval
flood.
(2) Collector streets shall be designed so they will not be overtopped
by the fifty-year recurrence interval flood.
(3) Local streets shall be designed so they will not be overtopped by
the twenty-five-year recurrence interval flood.
D. New and replacement bridges and culverts.
(1) All new and replacement bridges shall be constructed in accordance
with all applicable state statutes and codes and shall be submitted
to the Department of Natural Resources to ensure compliance therewith.
(2) All new and replacement bridges and culverts over perennial waterways,
including pedestrian and other minor bridges, in addition to meeting
other applicable requirements, shall be designed so as to accommodate
the one-hundred-year recurrence interval flood event without raising
the peak stage, either upstream or downstream, more than 0.01 foot
above the peak stage for the one-hundred-year recurrence interval
flood.
(a)
Larger permissible flood stage increases may be acceptable for
reaches having topographic land use conditions which could accommodate
the increased stage without creating additional flood damage potential
upstream or downstream of the proposed structure.
(b)
Such bridges and culverts shall be so designed and constructed
as to facilitate the passage of ice flows and other debris.
E. Street grades.
(1) Street grades shall be established wherever practicable so as to
avoid excessive grading, the promiscuous removal of ground cover and
tree growth, and general leveling of the topography.
(2) All changes in street grades shall be connected by vertical curves
of a minimum length equivalent in feet to 15 times the algebraic difference
in the rates of grade for arterial streets and 1/2 this minimum for
all other streets.
(3) Unless necessitated by exceptional topography, subject to the approval
of the Plan Commission, the maximum center-line grade of any street
or public way shall not exceed the following:
(a)
Arterial and collector streets: 6%.
(b)
Minor streets, alleys, and frontage streets: 8%.
(c)
Pedestrianways: 8% and meeting all applicable "American with
Disabilities Act (ADA) Accessibility Guidelines."
(4) The grade of any street shall in no case exceed 12% or be less than
1/2 of 1%.
(5) Street grades may be varied as provided for in this Subsection
E.
F. Radii of curvature.
(1) When a continuous street center line deflects at any one point by
more than 10°, a circular curve shall be introduced having a radius
of curvature on said center line of not less than the following:
(a)
Arterial streets and highways: 500 feet.
(b)
Collector streets: 300 feet.
(d)
Rural and suburban streets: may be less than 100 feet in environmentally
sensitive areas as determined by the Plan Commission.
(2) A tangent at least 100 feet in length shall be provided between reverse
curves on arterial and collector streets.
G. Half streets. Where an existing dedicated or platted half street
is adjacent to the tract being subdivided by either a subdivision
plat or certified survey map, the other half of the street shall be
dedicated by the subdivider or condominium developer (as applicable).
The platting of new half streets shall not be permitted.
Streets shall intersect each other at as nearly right angles
as topography and other limiting factors of good design permit. In
addition:
A. Maximum number of streets converging at single intersection. The
number of streets converging at one intersection shall be reduced
to a minimum, preferably not more than two.
B. Number and distance between intersections along arterial streets
and highways. The number of intersections along arterial streets and
highways shall be held to a minimum. Wherever practicable, the distance
between such intersections shall not be less than 1,200 feet.
C. Rounding of property lines at street intersections required. Property
lines at street intersections may be rounded with a minimum radius
of 15 feet, or of a greater radius when required by the Plan Commission,
or shall be cut off by a straight line through the points of tangency
of an arc having a radius of 15 feet.
D. Continuous alignment of minor streets required at intersections.
Minor streets shall not necessarily continue across arterial or collector
streets, but if the center lines of such minor streets approach the
major streets from opposite sides within 250 feet of each other, measured
along the center line of the arterial or collector street, then the
location shall be adjusted so that the adjoinment across the major
or collector street is continuous; thus, a jog is avoided.
The widths, lengths, and shapes of blocks that are created shall
be suited to the planned use of the land, zoning requirements, overall
residential density, the need for convenient access, control and safety
of street traffic, and the limitations and opportunities of topography.
In addition:
A. Maximum block length. The length of blocks in residential areas shall not, as a general rule, be less than 600 feet nor more than 1,500 feet in length, unless otherwise dictated by Chapter
500, Zoning, exceptional topography, environmental features, request of the Plan Commission, or other limiting factors of good design.
B. Pedestrianways required at center of blocks over 900 feet in length.
Pedestrianways (easement or dedicated public right-of-way) of not
less than 20 feet in width may be required near the center and entirely
across any block over 900 feet in length where deemed essential by
the Plan Commission to provide adequate pedestrian circulation or
access to schools, parks, shopping centers, churches, or transportation
facilities.
C. Block width. The width of blocks shall be wide enough to provide
for two tiers of lots of appropriate depth, except where otherwise
required to separate residential development from through traffic.
Width of lots or parcels reserved or laid out for commercial or industrial
use shall be adequate to provide for off-street service and parking
required by the use contemplated and the area zoning restrictions
for such use.
D. Mid-block utility easements required. Utility easements for electric
power and telephone service shall, where practical, be placed on mid-block
easements along rear lot lines.
The size, shape, and orientation of lots shall be appropriate
for the location of the subdivision and for the type of development
and use contemplated. The lots should be designed to provide an aesthetically
pleasing building site and a proper architectural setting for the
building contemplated. In addition:
A. Lot lines. Lot lines shall follow municipal boundary lines rather
than cross them.
B. Double frontage lots. Double frontage and reverse frontage lots shall
be prohibited except where necessary to provide separation of residential
development from through traffic or to overcome specific disadvantages
of topography and orientation.
C. Except as otherwise provided herein, every lot less than 40,000 square
feet in area shall front or abut for a distance of at least 40 feet
on a dedicated public street. Every lot 40,000 square feet or greater
in area shall front or abut for a distance of at least 66 feet on
a dedicated public street, except all lots that abut a cul-de-sac
shall abut no less than 45 feet.
D. Area and dimensional requirements of lots. Areas and dimensions of all lots shall conform to the requirements of Chapter
500, Zoning. Those building sites not served by a public sanitary sewage system or other approved system shall be sufficient to permit the use of an on-site soil absorption sewage disposal system designed in accordance with Chs. SPS 383 and 385, Wis. Adm. Code, and all applicable Washington County codes.
E. Lot depth. Excessive depth of lots in relation to width shall be
avoided. Depth of lots or parcels reserved or laid out for commercial
or industrial use shall be adequate to provide for off-street service
and parking required by the use contemplated.
F. Lot width. Width of lots shall conform to the requirements of Chapter
500, Zoning, or other applicable ordinance.
G. Corner lots. Corner lots which are one acre or less in area shall
have an extra width of 10 feet to permit adequate building setbacks
from side streets.
H. Plats abutting a lake or stream. In any plat abutting a lake or stream,
lands lying between the meander line and the water's edge and any
otherwise unplattable lands which lie between a proposed subdivision
and the water's edge shall be included as part of lots, outlots, or
public dedications.
I. Land remnants. All remnants of lots below minimum size left over
after subdividing of a larger tract must be added to adjacent lots
or a plan shown as to future use rather than allowed to remain as
unusable parcels.
This section sets forth vehicular access requirements for certified
survey maps and subdivision plats and condominiums which abut both
arterial, collector, and minor streets. This chapter recognizes that
public streets are a public investment which require control mechanisms
in order to assure both public safety and functional capacity. Proposed
certified survey maps, subdivision plats, and condominiums for residential
and nonresidential uses shall meet the following requirements:
A. Access standards for all residential and nonresidential uses. All
proposed certified survey maps, subdivision plats, and condominiums
proposed for residential and/or nonresidential uses located in residential
and/or nonresidential zoning districts shall meet the following standards:
(1) Controlled access to public streets. Lot and parcel vehicular access
points shall be permitted only at locations in accordance with this
chapter and other Town of Barton adopted Comprehensive Plan or elements
thereof, ordinances, or other plans approved by the Plan Commission.
The Plan Commission may limit vehicular access to any adjoining arterial,
collector, or minor street.
(2) Distance between vehicular access points. The spacing of vehicular
access points from arterial, collector, and minor streets to lots
and parcels shall be determined as a function of arterial street and
highway, collector street, and minor street operating speeds. The
minimum spacing between vehicular access points along such streets
or highway shall be determined according to Table 2. These spacings
are based upon average vehicle acceleration and deceleration rates
and are considered necessary to maintain safe traffic operation.
|
Table 2
Street and Highway Operating Speed and Minimum Spacing
Between Direct Vehicular Access Points
|
---|
|
Street/Highway Speed Limit
(miles per hour)
|
Minimum Driveway Spacing Measured at the Street Right-of-Way
Line
(feet)
|
---|
|
25
|
105
|
|
30
|
125
|
|
35
|
150
|
|
40
|
185
|
|
45
|
230
|
|
50
|
275
|
|
Source: American Planning Association. Planning Advisory Service
(PAS) Memo, July 1983.
|
(3) Limitation of access to interstate, United States, and state trunk
highways. No new direct vehicular access shall be allowed to interstate,
United States, and state trunk highway public rights-of-way unless
approved by the Wisconsin Department of Transportation, Washington
County, and the Plan Commission.
(4) Temporary access.
(a)
Town streets. On Town streets, the Town Board may grant temporary
access to properties and require their closure when access through
adjoining properties is acquired upon recommendation by the Plan Commission.
Such access shall be temporary, revocable, and subject to any conditions
required and shall be issued for a period not to exceed 12 months.
(b)
County highways. Temporary access to county highway rights-of-way
shall be reviewed and may be approved by the Washington County Highway
Department. It is the subdivider's or condominium developer's responsibility
(as applicable) to obtain all necessary approvals from the Washington
County Highway Department for all such temporary access points proposed
prior to certified survey map, subdivision plat, or condominium approval
by the Town.
(c)
State highways. Temporary access to state highway rights-of-way
shall be reviewed and may be approved by the Wisconsin Department
of Transportation. It is the subdivider's or condominium developer's
responsibility to obtain all necessary approvals from the Wisconsin
Department of Transportation for all such temporary access points
proposed prior to certified survey map, subdivision plat, or condominium
approval by the Town.
(5) Area circulation plan. The Plan Commission may require the preparation
of an area circulation plan for the proposed certified survey map,
subdivision plat, or condominium or covering several properties in
an area surrounding a proposed certified survey map, subdivision plat,
or condominium. The delineation of the area for the preparation of
an area circulation plan shall be determined by the Plan Commission.
Such a plan may require the sharing of access locations or temporary
access. All landowners, except those with a previously approved certified
survey map, subdivision plat, or condominium, shall be required to
conform to such an area circulation plan once it is adopted by the
Plan Commission as a component, or element, of the Town Comprehensive
Plan. The Plan Commission may require that such an area circulation
plan be prepared based upon the conduct of a traffic impact analysis
conducted by a licensed professional engineer with expertise in traffic
engineering. The Town Engineer shall review all such studies and assist
the Plan Commission.
(6) Vehicular nonaccess reservations required. The Plan Commission may
require that deed restrictions be placed on certified survey maps,
subdivision plats, or condominiums in order to limit vehicular access
to abutting arterial, collector, or minor streets and highways. A
landscaped buffer yard of adequate opacity, determined by the Plan
Commission or other Town ordinances, shall be provided in vehicular
nonaccess reservations along the property line abutting a public street
right-of-way. In such situations, vehicular access to such lots may
be provided by an abutting minor or collector street at designated
access driveways. Such vehicular nonaccess reservations shall be graphically
so noted on certified survey maps, subdivision plats, or condominium
plats prior to their approval by the Town.
(7) Arterial street and highway access and street intersections. No new
direct public or private access shall be permitted to an arterial
street or highway within 115 feet of the intersection of the right-of-way
lines of another arterial street or highway, and, where lot or parcel
size permits, no new direct public or private access shall be permitted
to an arterial street or highway within 500 feet of the intersection
of the right-of-way lines of another arterial street.
(8) Minor streets and vehicular access point alignments. Minor streets
and vehicular access points along both sides of a collector and/or
arterial street shall be aligned to assist in reducing the number
of driveways needed and to improve safety conditions related to access
to the street system.
(9) Sight distance and driveway placement. Direct vehicular access placement
on abutting minor, collector, and arterial streets and highways shall
be such that an exiting vehicle has a minimum unobstructed sight distance
according to Table 3 based upon the operating design speed of the
abutting collector or arterial street or highway.
|
Table 3
Highway Design Speed and Minimum Required Sight Distance
for Direct Vehicular Access Point Placement
|
---|
|
Highway Design Speed
(miles per hour)
|
Minimum Sight Distance
(feet)
|
---|
|
30
|
200
|
|
35
|
225
|
|
40
|
275
|
|
45
|
325
|
|
50
|
350
|
|
Source: American Planning Association. Planning Advisory Service
(PAS) Memo, July 1983.
|
B. Access standards for nonresidential and multiple-family residential
uses. All proposed certified survey maps, subdivision plats, and condominiums
proposed for nonresidential and multiple-family residential uses located
in nonresidential and/or multiple-family residential zoning districts
shall meet the following standards:
(1) Maximum number of vehicular access points per lot. Generally, along
arterial streets and highways (including lots which abut the frontage
roads of said rights-of-way), where the abutting street frontage is
less than 400 feet, a maximum of one vehicular access point shall
be permitted to a particular lot from each of any one or two abutting
arterial streets and highways. One additional driveway entrance along
a single continuous lot with frontage in excess of 400 feet may be
permitted by the Plan Commission. When a shared vehicular access point
is used by two or more abutting lots, said shared vehicular access
point shall be considered as one single vehicular access point for
each lot or parcel served.
(2) Provision of shared vehicular access points between lots. Vehicular
access points planned to be located along property lines, or within
five feet of a property line, shall be shared vehicular access points
with the abutting lot or parcel. The vehicular access point center
line may be the property line between two lots or parcels of land
or may be a mutually agreed upon land access easement.
Building setback lines appropriate to the location and type
of development contemplated, which are more restrictive than the regulation
of the zoning district in which the subdivision, certified survey
map, or condominium is located, may be required by the Plan Commission.