(A) Minimum widths.
(1) Minimum right-of-way widths and pavement widths (face-to-face of curb) for each type of public street or road shall be as follows:
Type of Street | Right-of-way Width | Roadway Width Including Shoulders |
Collector/commercial | 5W | 44 feet |
Cul-de-sac | 60 feet minimum turnaround radius | 45 feet turnaround radius |
Industrial | 80 feet minimum | 44 feet |
Local street (rural) | 60 feet minimum | 24-foot wide paved surface with a four-foot wide aggregate shoulder |
Local street (urban) | 60 feet minimum | 32 feet, measured from face of curb to face of curb |
Minor arterial | 120 feet minimum | As determined by traffic needs |
(2) The determination of the type of street necessary to serve a development shall be made by the City Council. The type of road to be constructed, whether it be rural or urban, shall be based on the existing and proposed topography, impact on adjoining properties, drainage consideration, environmental concerns, traffic projections and other aspects of the development.
(3) It is the city’s intent to provide a roadway that both meets sound engineering principles and is consistent with the nature of the development to be served. Review by the Planning Commission and City Council will include findings of fact which detail the special considerations given to a particular development.
(B) Dedication of additional width. Where a subdivision abuts or contains an existing street of inadequate width, sufficient additional width shall be dedicated to meet the above standards.
(C) Special conditions. Additional right-of-way and roadway widths may be required to promote public safety and convenience when special conditions require it or to provide parking space in areas of intensive use.
(D) Restriction of access. Access of local streets onto state, county state-aid highways and county highways shall be discouraged at intervals of less than 500 feet.
(E) Street jog. Street jogs with centerline offsets of less than 150 feet shall not be allowed.
(F) Deflection. When connecting street lines deflect from each other at any one point by more than ten degrees, they shall be connected by a curve with a centerline radius of not less than 200 feet.
(G) Grades. Centerline gradients shall be at least 0.5% and grades shall not exceed 8%.
(H) Vertical curves. The State Department of Transportation Road Design Manual, § 2-45.07, shall govern vertical curves. The minimum length of a vertical curve shall be 100 feet.
(I) Angle of intersection. The angle formed by any intersection of streets shall be 90 degrees unless a different angle is approved by the City Engineer. In no case shall the angle be less than 75 degrees.
(J) Size of intersection. Intersections of more than four corners shall be prohibited.
(K) Corner radii. Roadways of street intersections shall be rounded by a radius of not less than 25 feet. Roadways on alley-street intersections shall be rounded by a radius of not less than six feet. Corners at the entrances of the turnaround portions of the cul-de-sacs shall be rounded by a radius of not less than 15 feet.
(L) Curb and gutter. Curb and gutter may be included as part of the required street surface improvement and shall be designed for installation along both sides of all roadways for urban design.
(M) Elevation of new streets. All new streets located in the floodplain shall be elevated to no lower than the regulatory flood protection elevation.
(Prior Code, § 12-1380) Penalty, see § 160.999