(A) Street layout. Adequate streets shall be provided by the subdivider and the arrangement, character, extent, width, grade, and location of each shall conform to the comprehensive plan of the city and shall be considered in their relation to existing and planned streets, to topographical conditions, to public safety and convenience, and in their appropriate relationship to the proposed uses of land to be served by such streets. The street layout shall be devised for the most advantageous development of the entire neighborhood and shall minimize the opportunity for through traffic in neighborhoods. Trees which are required to be shown on the preliminary plat shall be avoided whenever possible in the construction of streets.
(B) Relation to adjoining street system. Where necessary to the neighborhood pattern, existing streets in adjoining areas shall be continued, and shall be at least as wide as such existing streets and in alignment therewith.
(C) Projection of streets. Where adjoining areas are not subdivided, the arrangement of streets in the subdivision shall make provision for the proper projection of streets into such unsubdivided areas.
(D) Street jogs. Whenever possible, street jogs with center line offsets of less than 150 feet shall be avoided.
(E) Half-streets or adjacent streets. Street intersections shall be as nearly at right angles as practicable, giving due regard to terrain and topography. In no case will intersections at angles more acute than 70 degrees be permitted.
(F) Street intersections. Street intersections shall be as nearly at right angles as practicable, giving due regard to terrain and topography. In no case will intersections at angles more acute than 70 degrees be permitted.
(G) Dead-end streets. Dead-end streets as defined in § 150.007 shall be allowed with sufficient turning radius for emergency vehicles.
(H) Cul-de-sacs. Cul-de-sac streets shall have a turnaround of not less than 45 feet in diameter of pavement in residential areas, and not less than 50 feet in diameter of pavement in commercial.
(I) Streets on comprehensive plan. Where a subdivision embraces a street as shown on the comprehensive plan of the city, such street shall be platted in the location and of the width indicated by the comprehensive plan. Areawide needs shall be addressed through the procedures specified in § 150.280.
(J) Design and construction standards. Street design proposals shall be certified by a registered professional engineer as to maintainability, operation, safety and traffic design with due regard to subgrade conditions, base and pavement specifications, grades, curves, speed limits and adequacy of drainage. The subdivider shall excavate, fill, grade and pave all streets, including sidewalk areas. No street shall be surfaced until the underground utilities which are to be installed in the portions of the streets intended for vehicular traffic have been so installed and inspected. The city's engineer shall be responsible for approving the specifications for design and construction. Texas Highway Department Standard Specifications shall be the minimum standard.
(K) Pavement widths and right-of-way. Pavement widths and rights-of-way shall be as follows:
(1) Major arterial streets shall have a right-of-way width of at least 90 feet, with a pavement width of at least two divided 27-foot lanes.
(2) Minor arterial streets shall have a right-of-way of at least 70 feet and a pavement width of at least 36 feet.
(3) Collector streets shall have a right-of-way of at least 60 feet and a pavement width of at least 24 feet.
(4) Local streets shall have a right-of-way width of at least 60 feet and a pavement width of at least 18 feet with ribbon curbing causing a total width of 20 feet.
(L) Pavement widths and rights-of-way of streets forming part of the subdivision. Pavement widths and rights-of-way of streets forming part of the subdivision shall be as follows:
(1) The subdivider shall dedicate a right-of-way of 90 feet in width for new adjacent major arterial streets, and two lanes each with 27-foot widths shall be paved.
(2) New major arterials, minor arterials, collector, and local streets shall conform to § 150.298(Q).
(3) Where the proposed subdivision abuts upon an existing street or half-street that does not conform to the requirements of this division, the subdivider shall dedicate right-of-way sufficient to make the full right-of-way width conform to such division, and there shall be paved so much of such right-of-way as to make the full pavement width comply with such division. Before any pavement is laid to widen existing pavement, the existing pavement shall be cut back at least two feet to assure an adequate sub-base and pavement joint.
(M) Curbs. Ribbon curbs shall be installed by the subdivider on both sides of all interior streets, and on the subdivision side of all streets forming part of the boundary of the subdivision. In lieu of curbs and gutters, ribbon curbs shall be constructed of Portland cement concrete at least 12 inches in width, and 18 inches in depth and flush with the pavement. Materials shall conform to the City of Austin Standard Specifications for Public Works Construction as amended.
(N) Roadway drainage.
(1) As a general rule, drainage carried in roadside channels shall be minimized and off-roadway locations shall be used as the primary drainage network whenever practicable.
(2) When roadside channels are required, they shall be contained within a dedicated right-of-way or right-of-way easement. Channel sideslopes shall be no steeper than four to one, except for curves and transitions where slope stabilization acceptable to the City's Engineer may be allowed. Roadways shall be designed for fordable driveway approaches whenever practical. All driveways shall be designed such that drainage flow from a 25-year storm shall not exceed a depth of 12 inches on any portion of the driveway. Should driveway culverts be required, the culvert design, capacity, and general location shall be shown on the construction plans. In no case shall driveway approaches constitute a blockage of roadway drainage.
(O) Street names. Names of new streets shall not duplicate or cause confusion with the names of existing streets in the cities of Sunset Valley and Austin unless the new streets are a continuation of or in alignment with existing streets, in which case names of existing streets shall be used.
(P) Street lights. Street lights shall be installed by the subdivider at major street intersections within the subdivision and at major intersections on the boundaries of the subdivision inside the corporate limits of the city, as deemed appropriate by the City Council.
(Q) Street signs. Street signs shall be installed by the subdivider at all intersections within or abutting the subdivision. Such signs shall be of a type approved by the city, and shall be installed in accordance with standards of the city.
(R) Street striping. Striping shall be applied by the subdivider in compliance with state and city guidelines.