The following requirements shall also be met when planning the street network:
(A) Streets shall intersect, as nearly as possible, at right angles.
(B) Land access street curb intersections shall be rounded by radii of at least fifteen (15) feet; intersections involving collector streets shall have radii of not less than twenty‑five (25) feet.
(C) Street jogs with center line offsets of less than one hundred twenty‑five (125) feet are prohibited.
(D) “Unless topography indicates a need for a greater length, dead‑end streets, designed to be so permanently, shall be no longer than five hundred (500) feet and shall terminate a circular open space having a radius at the outside of the pavement of at least fifty (50) feet and a diameter at the outside of the right‑of‑way of at least one hundred twenty (120) feet. This length may be increased where topography or existing conditions prohibit a reasonable connection.”
(E) Land access streets shall be designed so as to discourage through traffic.
(F) No land access street shall be in excess of ten percent (10%) grade and no collector street grade shall be in excess of eight percent (8%) grade, except as otherwise approved by the Planning Commission due to adverse topographic conditions. For adequate drainage, the minimum grade of any new street shall not be less than one‑half (1/2) of one percent (1%).
(G) The Planning Commission shall not approve streets which will be subject to frequent inundation or flooding.
(H) Alleys shall be avoided in single‑family and two-family districts; however, alleys may be required in multiple-family districts and commercial or industrial districts unless other definite and assured provision is made for service access, such as off‑street loading, unloading and parking, consistent and adequate for the use proposed.
(I) Dead‑end alleys shall not be permitted, except where provided with adequate turn‑around facilities at the dead‑end, or where such dead‑end alleys provide the only access to off‑street parking or loading spaces.
(J) Alleys, where provided, shall have a right‑of‑way of not less than twenty (20) feet.
(K) Intersection of more than two (2) streets at one (1) point shall be prohibited.
(L) Where subdivision abuts on or contains an existing or proposed area service highway, the Planning Commission may require that marginal access streets be provided in order that no lots front on such existing or proposed area service highway.
(M) Wherever the Illinois Department of Transportation or the County of Union has gone on record as desiring the relocation and/or the construction of a new highway or whenever a municipality has duly recorded with the County a comprehensive plan and/or adopted an official map defining the location of streets, the subdivider shall reserve rights‑of‑way for the alignments and widths as prescribed by the appropriate jurisdictional agency.