§ 50-583. Street system layout.

(a)

The proposed street layout shall provide for the continuation of projection of existing streets in the surrounding areas unless the board of county commissioners deems such extension undesirable for specific reasons of topography or design.

(b)

Streets shall be logically related to the topography to produce usable lots and acceptable grades.

(c)

Minor streets shall be designed to discourage through traffic. However, provision for street connection and access to or from adjacent areas will generally be required.

(d)

Where a subdivision abuts or contains an existing or proposed collector or other high-service road, frontage roads, rear service alleys, reverse frontage lots or other such treatment, as required, will be provided for protection of abutting properties, to reduce the number of intersections with major streets and separate local and through traffic.

(e)

Streets shall intersect as nearly as possible at right angles. No street shall intersect another at an angle of less than 60 degrees.

(f)

Multiple intersections, involving 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.

(g)

Streets entering opposite sides of another street shall either be directly opposite one another or with a minimum offset of 125 feet between centerlines.

(h)

Where a subdivision abuts or contains an existing street of inadequate right-of-way width, additional right-of-way may be required.

(i)

Cul-de-sac streets with no provision for extension shall not exceed 1,200 feet in length and shall provide access to no more than 20 lots.

(j)

Cul-de-sac rights-of-way shall have a minimum diameter of 100 feet.

(k)

Unless future extension is clearly impractical or undesirable beyond a turnaround, rights-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 street.

(l)

To facilitate procurement of right-of-way for the future needs of the county collector roadway system, 50 feet on each side of all section lines shall be dedicated for roadway purposes.

(1)

When a development lies along one side of a section line and no road or dedicated right-of-way exists along the opposite side of the section line, the developer may, with approval of the board of county commissioners, upon recommendation of the planning commission:

a.

Dedicate the required right-of-way and install no improvements. However, no lots, tracts or parcels shall require access from such and unimproved right-of-way; or

b.

Construct a full road section on 50 feet (minimum) right-of-way and incorporate such road into street system of the development.

(2)

When a development lies along one side of a section line and there exists a previously dedicated unimproved right-of-way, the developer may, with approval of the board of county commissioners, upon recommendation of the planning commission:

a.

Dedicate the required right-of-way and install no improvements. However, no lots, tracts or parcels shall require access from such unimproved right-of-way; or

b.

Construct a full road section centered on the right-of-way centerline or as right-of-way configuration requires and incorporates such road into street system for the development.

(3)

When a development lies along a section line and there exists a roadway constructed along the opposite side of the section line, the developer may, with approval of the board of county commissioners, upon recommendation of the planning commission:

a.

Dedicate the required right-of-way and not utilize the existing roadway to serve the development; or

b.

Dedicate the required right-of-way and utilize the existing roadway or further improve such roadway to serve the development.

(m)

The street system shall connect directly to a street which is maintained by the state, county or other governmental agency.

(n)

Any new public rock road tying into an existing paved road must be paved from the point of curvature of the radius of the new road to the edge of the pavement of the existing paved road.

(o)

Any new road tying into a state-maintained road, arterial road, major collector road or any other road as deemed necessary by the county road department must have paved acceleration and deceleration lanes along the road being accessed to. These lanes shall be built according to the specifications required by the state department of transportation.

(p)

Subdivision contiguous to designated arterial roads must conform to those standards for controlled access and frontage roads as contained in the county comprehensive plan and article XII of this chapter.

(q)

If multiple-access driveways are permitted as an interim measure, the subdivision plat will clearly denote them as "temporary," and will provide for dual access by adjoining lots.

(1991 LDR ch. 71, § 4.07)

TYPICAL ROAD SECTION FOR LOCAL I & II

Surface course (if required): One and one-quarter inch minimum state department of transportation type II Asphaltic Concrete.

Base—Without Surface Course: Six-inch minimum of compacted or other suitable material, approved by the county road department; alternately may be eight inches minimum of loose limerock or other suitable material mixed with clean sand, compacted after mixing and having a compacted depth of 12 inches and 21 feet width.

Base—With Surface Course: Six-inch minimum of compacted limerock or other suitable material, approved by the county road department, and 21 feet width.

Subgrade Stabilization: When required, subgrade stabilization shall be accomplished by mixing limerock or other suitable material, approved by the county road department with clean sand; stabilized subgrade must be a minimum of eight inches—ten inches in depth and 22 feet wide and must be approved by the county road department prior to and after mixing. The road department requires four to five inspections: 1. clearing; 2. grading; 3. limerock base; 4. surface; 5. final; either by telephone request or letter, with two days' notice.

Where, in the opinion of the county road department, it is necessary, area shall be fertilized, seeded, mulched, and watered to prevent erosion.

GRAPH

TYPICAL ROAD SECTION FOR ARTERIAL ROAD, AS ALONG A SECTION LINE

(1)

Surface course is always required: One and one-quarter inch minimum state department of transportation type II Asphaltic Concrete.

(2)

Base: Eight inches thickness minimum and 24 feet wide of compacted limerock or other suitable material, approved by the county road department.

(3)

Subgrade stabilization: When required, subgrade stabilization shall be accomplished by mixing limerock or other suitable material, approved by the county road department with clean sand; stabilized subgrade must be a minimum of 12 inches in depth and 26 feet wide and must be approved by the county road department. The road department requires four to five inspections: 1. clearing; 2. grading; 3. limerock base; 4. surface; 5. final; either by telephone request or letter, with two days' notice.

(4)

Where, in the opinion of the county road department, it is necessary, area shall be fertilized, seeded, mulched, and watered to prevent erosion.

GRAPH

TYPICAL ROAD SECTION FOR COLLECTOR I & II

(1)

Surface course (if required): One and one-quarter inch minimum state department of transportation type II Asphaltic Concrete.

(2)

Base—Without Surface Course: Six-inch minimum of compacted or other suitable material. approved by the county road department: alternately may be eight inches minimum of loose limerock or other suitable material mixed with clean sand, compacted after mixing and having a compacted depth of 12 inches and 21 feet width.

(3)

Subgrade stabilization: When required, subgrade stabilization shall be accomplished by mixing limerock or other suitable material. approved by the county road department with clean sand: stabilized subgrade must be a minimum of eight inches - ten inches in depth and 22 feet wide and must be approved by the county road department prior to and after mixing. The road department requires four to five inspections: 1. clearing; 2. grading; 3. limerock base; 4. surface; 5. final; either by telephone request or letter, with two days' notice.

(4)

Where, in the opinion of the county road department, it is necessary, area shall be fertilized, seeded, mulched and watered to prevent erosion.

GRAPH