[1960 Code, Secs. 13.28.010, 13.28.020, 13.28.030, 13.28.040,
13.28.050, 13.28.060, 13.28.070, 13.28.080, 13.28.090, 13.28.100,
13.28.110, 13.28.120, 13.28.130, 13.28.140]
(A)
Continuation Of Existing Streets: Proposed streets shall, as near
as practicable, provide for the continuation, connection or projection
of streets in surrounding areas, or may conform to a plan for one
of Lincoln's neighborhoods as may have been approved by the City engineer
and adopted by the Plan Commission and City Council.
(B)
Circulation Requirements: The street pattern shall provide ease of
circulation within the subdivision, but the local streets therein
shall be so laid out that their use by through traffic will be discouraged.
Insofar as practicable, the street arrangement should provide proper
access to schools, playgrounds, transportation and other community
features. New street openings shall generally be prohibited within
600 feet of any major intersection or crossing such as those formed
by a railroad and a highway, two or more highways or from the head
of any major bridge, grade separation structure or like facilities,
as measured along the centerline from the intersection or from such
structures.
(C)
Topographical And Cultural Features: In sloping terrain, streets
shall generally run parallel to the contour of the land or preferably
cross at a slight angle therewith. The general objectives are to avoid
steep street grades; heavy concentrations of storm surface runoff;
abnormal differentials in building elevations at opposite sides of
the street; and excessive grading operations. Appropriate treatment
shall be given to encourage the preservation of existing views, wooded
areas, creeks and other attractive natural features of the plat.
(D)
Street Names: Names of new streets shall not duplicate the names
of existing streets of record. New streets which are extensions of
or in alignment with existing streets shall bear the name of the existing
streets. All names shall meet with the approval of the Plan Commission.
(E)
Portion Of Tract: Where the plat to be submitted includes only a
part of the tract owned by the subdivider, the Council should require
topography and a sketch layout of the future street system on the
unsubdivided portion.
(F)
Relation To Major Street: Where a subdivision abuts or contains an
existing or proposed arterial street, involving heavy volumes of high
speed vehicular traffic, the Plan Commission and City Council may
require marginal access streets, or a reverse lot frontage with screen
planting or masonry wall contained in a nonaccess reservation along
the rear property line, and such other treatment as may be necessary
for adequate protection of the proposed industrial, commercial or
residential development to assure separation of through and local
traffic. Before requiring any marginal streets or reverse frontage
arrangements, the Plan Commission and City Council shall take into
account and decide upon the physical location of the major public
utility lines as they relate to the existing and potential development
along both sides of the highway.
(G)
Marginal Streets (Reverse Frontage Arrangements): The Plan Commission
and City Council shall take into account and decide upon the physical
location of the major public utility lines as they relate to the existing
and potential development along both sides of the highway.
(H)
Street Frontage Along Railroads: Where a subdivision borders on a
railroad right of way, the Plan Commission and City Council may require
a street approximately parallel to the side of such right of way,
and at a reasonable distance therefrom, dependent on the nature and
intended use of the subdivision. Such distance shall also be determined
with due regard for the requirements of future grade separation facilities
and access roads or ramps thereto.
(I)
Street Intersections: The angle of intersection between minor streets
and major streets should not vary by more than 10° from a right
angle. All other streets should intersect each other as near to a
right angle as possible and no intersection of streets at angles of
less than 70° shall be permitted.
(J)
Street Jogs: Street jogs shall be avoided whenever possible. However,
where permitted, the minimum centerline offset distance between roads
entering a common right of way from opposite sides will be 150 feet.
(K)
Half Streets: Half streets shall be prohibited. In case a half street
is adjacent to a tract to be subdivided, the other half of the street
shall be platted within such tract.
(L)
Reserve Strips: Reserve ("spite" or "devil") strips controlling access
to streets shall not be permitted. Streets shall be located on the
edge of, or one lot depth away from, the boundary of the tract.
(M)
Dead End Streets: Dead end or stub end streets are prohibited. However,
where it is necessary to provide circulation to undeveloped property
adjacent to the boundaries of the proposed subdivision, a temporary
cul-de-sac with a turnaround radius of not less than 75 feet shall
be provided within the subdivision and adjacent to its limit for what
would otherwise be a stub end street. Provision will be made by the
subdivider that when the right of way is extended into the adjacent
property that portion of the turnaround in excess of the right of
way width will revert to the adjacent property owner or owners and
curbs and gutters will be provided.
(N)
Cul-De-Sac: Cul-de-sacs, designed to be so permanently, shall not
be longer than 500 feet and shall be provided at the closed end with
a turnaround having an outside roadway diameter of at least 100 feet,
and a street property line diameter of at least 120 feet. No cul-de-sac
may intersect with another cul-de-sac.
[1960 Code, Sec. 13.28.150]
Alleys may be provided in residential developments, where necessary.
Service roadways will be required in commercial and industrial developments,
except where other provisions for suitable access and off street loading
and unloading is assured. Alleys may be provided at the rear of all
lots or tracts intended for multiple-family building use; however,
they will not be encouraged.
[1960 Code, Sec. 13.28.160]
In the case of the extension of an existing adjoining right
of way, having a width less than the minimum requirement, the Plan
Commission may approve the extension thereof at the same width.
[1960 Code, Sec. 13.28.170]
The Plan Commission and City Council will determine the required minimum dimensional standards of all rights of way, pavements, sidewalks and other public improvements, but shall consider the advice and recommendations of the City engineer in so doing. In the case where topography or other conditions make dedication of a street or part thereof of the required minimum width impractical, the Plan Commission may modify the above requirements. It may also increase the minimum width subject to approval by the City Council. The typical street requirements shall be as follows in Sections 12-7-5 through 12-7-9 of this chapter.
[1960 Code, Sec. 13.28.180; amended Ord.
56, 6-20-1977]
Minimum standards for street design shall be as follows:
|
Major Street
|
Collector Street
|
Local Street
|
Marginal Access Street (Frontage)
|
Cul-De-Sac And Short Streets
| |
|---|---|---|---|---|---|
|
Right of way width
|
See table, major street characteristics, Section 12-7-6 of this chapter
|
See table, collector street characteristics, Section 12-7-7 of this chapter
|
See table, local street characteristics, Section 12-7-8 of this chapter
|
50'
|
50'
|
|
Pavement width (back to back of curb)
|
See table, major street characteristics, Section 12-7-6 of this chapter
|
37'
|
37'
|
37'
|
37'
|
|
Minimum radius of horizontal curves (road centerline dimension)
|
475' (12°)
|
300' (19°)
|
200' (28°)
|
200' (28°)
|
100' (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 centerline dimension)
|
100'
|
100'
|
50'
|
50'
|
50'
|
|
Maximum gradient
|
5%
|
6%
|
8%
|
8%
|
10%
|
|
Minimum gradient
|
0.5%
|
0.5%
|
0.5%
|
0.5%
|
0.5%
|
|
Minimum clear (vertical)
|
500'
|
300'
|
200'
|
200'
|
100'
|
|
Sight distance (horizontal)
|
500'
|
300'
|
100'
|
100'
|
100'
|
|
Minimum curb tangents at street intersections
|
52'
|
30'
|
30'
|
30'
|
30'
|
[1960 Code, Sec. 13.28.190; amended Ord.
56, 6-20-1977]
The right of way widths are suggested for use as shown on the
major street characteristics table in this section. As the geometrical
design, pavement and right of way widths may vary considerably over
that of a typical local street, the Plan Commission and City Council
shall decide upon the pavement width and the portion of the major
street construction that shall be done by the developer. In doing
so, the Plan Commission and City Council shall take into account the
location, extent and character of the proposed development, the degree
to which the proposed lots or land use is to be serviced from or otherwise
has access on the major streets; the number of anticipated employees;
and the extent of vehicular traffic that may be generated by such
improvement or subdivision upon such major street or streets. The
Plan Commission and City Council in determining the amount of participation
that shall be made by the subdivider, shall also take into account
the cost and participation involved in the trunk sewers and possible
extra cost in length of service connections, driveway aprons, etc.
(A)
Purpose. To serve high volume traffic moving between principal areas
of the City or through the City and to collect and distribute traffic
from freeways and expressways to collector and local streets or direct
access to abutting property.
(B)
Traffic Lanes: Four to six.
(C)
Design Year Hourly Volumes: 855 to 2,990.
(D)
Operational Characteristics: Continuous route through urban area,
designed to expedite safe movement of through traffic by control of
entrances, exits, curb use, etc., major intersections signalized,
parking lanes possible but discouraged, direct access to most abutting
property.
(E)
Planning Characteristics: Should be spaced every 2 1/2 miles
throughout the community to best serve areas of high traffic concentration,
and help to define residential neighborhoods, industrial sites and
commercial areas.
|
Major Street Characteristics
| ||||||
|---|---|---|---|---|---|---|
|
Two-Way Operation
| ||||||
|
Two-Way DHV-20
|
Design Speed
|
Pavement Width
|
Median Width
|
Median Type
|
Parking Lanes
|
ROW Width
|
|
1,995-2,990
|
40
|
37'
|
4'-18'
|
Barrier
|
2 at 10'
|
50'
|
|
1,710-2,565
|
40
|
37'
|
4'
|
Mountable
|
2 at 10'
|
50'
|
|
855-1,995
|
30
|
37'
|
4'-18'
|
Barrier
|
2 at 10'
|
50'
|
|
855-1,710
|
30
|
37'
|
4'
|
Mountable
|
2 at 10'
|
50'
|
|
Under 855
|
30
|
37'
|
None
|
—
|
2 at 10'
|
50'
|
|
Under 855
|
30
|
37'
|
None
|
—
|
1 at 10'
|
50'
|
|
Under 855
|
30
|
37'
|
None
|
—
|
None
|
50'
|
|
Major Street Characteristics
| ||||||
|---|---|---|---|---|---|---|
|
One-Way Operation
| ||||||
|
One-Way DHV-20
|
Design Speed
|
Pavement Width
|
Median Width
|
Median Type
|
Parking Lanes
|
ROW Width
|
|
Over 2,280
|
40
|
37'
|
None
|
—
|
2 at 10'
|
50'
|
|
1,520-2,280
|
40
|
37'
|
None
|
—
|
2 at 10'
|
50'
|
|
Under 1,520
|
30
|
37'
|
None
|
—
|
2 at 10'
|
50'
|
[1960 Code, Sec. 13.28.200; amended Ord.
56, 6-20-1977]
Collector street standards shall be as follows:
(A)
Purpose: To collect and distribute medium volume traffic between
major and local streets or abutting property and to serve secondary
traffic generators.
(B)
Traffic Lanes: Two lanes.
(C)
Current Average Daily Traffic: 1,000 to 5,000 vehicles.
(D)
Operational Characteristics: Direct access to all abutting property,
parking lanes provided as required, all local cross streets have stop
signs, signalization designed to discourage through traffic.
(E)
Planning Characteristics: Designed to function as a main interior
street within a neighborhood, spaced 1/4 to 1/2 mile apart, to principally
serve traffic destined or originating within that neighborhood.
|
Collector Street Characteristics
| ||||||
|---|---|---|---|---|---|---|
|
Current ADT1
|
Design Speed
|
Pavement Width2
|
Median Type
|
Parking Lanes
|
ROW Width2
|
Surface Type
|
|
1,000-5,000
|
30
|
37'
|
None
|
2
|
50'
|
Pavement
|
|
1,000-5,000
|
30
|
37'
|
None
|
1
|
50'
|
Pavement
|
|
1,000-5,000
|
30
|
37'
|
None
|
0
|
50'
|
Pavement
|
|
Note:
| |
|
1.
|
For current ADT of over 5,000, refer to Section 12-7-6, major street characteristics table, of this chapter.
|
|
2.
|
Exceptions to the above minimum widths will be considered for
resurfacing improvements and for improvements on purely residential
streets carrying very little through or truck traffic.
|
[1960 Code, Sec. 13.28.210; amended Ord.
56, 6-20-1977]
Local street standards shall be as follows:
(A)
Purpose: To provide easy direct access to abutting property and connect
with collector and/or major streets, discouraging all through traffic.
(B)
Traffic Lanes: Two.
(C)
Current Average Daily Traffic: Under 1,000 vehicles.
(D)
Operational Characteristics: Direct access to all abutting occasional
parking on one side, stop control at all streets of higher classification.
(E)
Planning Characteristics: Service at each block for all adjoining
property, to deliver trips to higher type facilities, make up from
70% to 80% of street mileage.
|
Local Street Characteristics
| ||||||
|---|---|---|---|---|---|---|
|
ADT
|
Design Speed
|
Pavement Width1
|
Median Type
|
Parking Lanes
|
ROW Width1
|
Surface Type
|
|
Under 1,000
|
25
|
37'
|
None
|
2
|
50'
|
Pavement
|
|
Under 1,000
|
25
|
37'
|
None
|
None
|
50'
|
Pavement
|
|
Note:
| |
|
1.
|
Exceptions to the above width will be considered for resurfacing
improvements and for improvements on purely residential streets carrying
very little through or truck traffic.
|
[1960 Code, Secs. 13.28.220, 13.28.230, 13.28.240, 13.28.250,
13.28.260, 13.28.270, 13.28.280; amended Ord. 56, 6-20-1977]
(A)
Dead End Street (Cul-De-Sac) Standards: Dead end street standards
shall be as follows: fifty-foot right of way; thirty-seven-foot pavement.
(B)
Marginal Access Street Standards: Marginal access street standards
shall be as follows: fifty-foot right of way; thirty-seven-foot pavement
as per county standards.
(C)
Alley Standards: Alley standards shall be as follows: twenty-four-foot
right of way; twenty-foot pavement with four-foot space for utilities
in apartment districts. Industrial or commercial areas, twenty-four-foot
pavement with four-foot space for utilities.
(D)
Crosswalk Standards: Crosswalk standards shall be as follows: ten-foot
right of way; at least four-foot four inch paved walkway along centerline.
(E)
Street Grade Standards: No street grade shall be less than 0.5% and
shall not exceed the following with the allowances for reasonable
vertical curves:
|
Type
|
Grade
|
|---|---|
|
Major street (arterial highway)
|
5%
|
|
Collector street
|
6%
|
|
Local streets and alleys
|
8%
|
|
Streets shorter than 500 feet and cul-de-sac
|
10%
|
(F)
Street Alignment Standards: Street alignment standards shall be as
follows:
1.
Vertical: 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 collector and local streets, at least 15 times.
2.
Minimum horizontal, radii of centerline curvature:
|
Major streets
|
12°
|
475 feet
|
|
Collector streets
|
19°
|
300 feet
|
|
Local streets
|
28°
|
200 feet
|
|
Dead end streets
|
58°
|
100 feet
|
A tangent at least 100 feet long shall be introduced
between reverse curves on major or collector streets and at least
50 feet on local streets.
3.
Visibility:
(a)
Minimum vertical visibility (measured 4 1/2-foot eye level
to 18 inches taillight) shall be:
500 feet on major streets
300 feet on collector streets
200 feet on local streets, and
100 feet on streets shorter than 600 feet
(b)
Minimum horizontal visibility shall be:
500 feet on major streets
300 feet on collector streets
100 feet on all other streets, as measured on such centerlines.
(G)
Intersection Standards: The radii on both pavement edge and right
of way is to be 30 feet, minimum, at all points of roadway intersection
and 52 feet for industrial or major street intersections.
