(A) Minimum required right-of-way widths.
(1) Principal and major arterial right-of-way widths shall be determined by the Town Engineer prior to submittal of a preliminary plat. The right-of-way requirement shall be based on the standards set forth in the general plan as mitigated by existing conditions of topography, traffic volume and traffic flow.
(2) Collector streets: 60 feet.
(3) Local streets:
(a) Local streets serving single-family residences only: 50 feet.
(b) Local streets serving multi-family, commercial or industrial frontages: 60 feet.
(c) Cul-de-sac streets shall terminate in a circular 50-foot radius right-of-way, with an improved traffic turning circle at least 40 feet in radius, or the Council may approve an alternate, yet equally convenient turn around configuration justified by unique or extraordinary conditions. Under no circumstances will a paved radius of deficient dimension for the access and maneuvering of emergency vehicles be allowed.
(4) Maximum length of cul-de-sac street: 600 feet measured along the street centerline from the intersection of right-of-way lines to the radius point of the turning circle.
(5) Alleys: 16 feet when there is residential property on both sides or 20 feet when abutting commercial or industrial districts.
(a) Alley intersections and sharp changes in alignment shall be avoided, but, where necessary, corners shall be cut off ten feet on each side to permit safe vehicular movement.
(b) Dead end alleys shall be prohibited.
(c) All “half” alleys shall have a minimum width of 12 feet.
(6) Dead-end streets shall not be approved except in locations designated by the Planning Commission as necessary for connection to adjacent unplatted lands. In any case, a dead-end street serving more than four lots shall provide, by easement, a temporary turning circle with a 40-foot radius or other acceptable design to accomplish the same purpose.
(7) Street widths:
Type of Streets | Graded Section | Pavement Width With Curbs | Type of Curbs |
Collector | 50 feet | 50 feet | Standard/roll |
Cul-de-sac | 32 feet | 36 feet | Roll |
Frontage | 32 feet | 40 feet | Roll |
Hillside | 32 feet | 40 feet | Roll |
Local | 32 feet | 40 feet | Roll |
(8) Pavement structural section design: all pavements constructed within rights-of-way which are to be dedicated to the town shall be as per the recommendations and design of an Arizona Registered Geotechnical or Civil Engineer.
(a) The subdivider shall submit to the Town Engineer a full report of the soils sampling and testing program conducted by the registrant, along with the registrants’ design recommendations and supporting calculations.
(b) The pavement subgrade preparation, base course and surfacing design recommendations must be approved by the Town Engineer as a part of the subdivision improvement plan review and approval process.
(9) Concrete curb and gutter and sidewalks required: all streets shall be constructed with Portland cement concrete curb and gutter along the pavement edge, with sidewalks located behind the back of curb. All curb and gutter and sidewalk design and construction shall conform with the requirements of the current M.A.G. Standard Details and Specifications for Public Works Construction.
(B) Grades.
(1) Maximum grades.
(a) Collector streets: 7%; and
(b) Local streets: 10%.
(2) Minimum grades. Concrete or asphalt streets with concrete gutters: 0.5%.
(C) Vertical curves. Collector and local streets minimum length: 100 feet.
(D) Horizontal alignment.
(1) When tangent centerlines deflect from each other more than ten degrees and less than 90 degrees, they shall be connected by a curve with a minimum centerline radius of 500 feet for collector streets, or 150 feet for local streets.
(2) Between reverse curves there shall be a tangent section of centerline not less than 100 feet long.
(3) Streets intersecting an arterial route shall do so at a 90-degree angle; local streets shall typically intersect at right angles, but in no case at less than 75 degrees.
(4) Street jogs with centerline offsets of less than 125 feet shall be avoided, except where unique or extraordinary conditions may justify modification as approved by the Planning Commission.
(5) Local streets intersecting a collector street or arterial route shall have a tangent section of the centerline at least 150 feet in length measured from the right-of-way line of the major street; except that no such tangent is required when the local street curve has a centerline radius greater than 400 feet measured from a center located in the major street right-of-way line.
(6) Street intersections with more than four legs and Y-type intersection with legs meeting at acute angles shall be prohibited.
(7) Street line intersections shall be rounded by a circular arc having a minimum tangent length of 12 feet.
(E) Maximum block length. Fifteen hundred feet measured along the centerline of the street and between intersecting street centerlines; except that in subdivisions where lot areas average one-half acre or more, this maximum may be exceeded by 500 feet.
(Ord. 01-95, passed 9-21-1995)