(a) The street layout of the subdivision shall be in general conformity with a plan for the most advantageous development of adjoining areas and the entire neighborhood.
(1) Where appropriate to the design, proposed streets shall be continuous and in alignment with existing, planned or platted streets with which they are to connect.
(2) Proposed streets shall be extended to the boundary lines of the tract to be subdivided, unless prevented by topography or other physical conditions or unless, in the opinion of the Commission, such extension is not necessary or desirable for the coordination of the layout of the subdivision with the existing layout or the most advantageous future development of adjacent tracts. Dead-end streets of reasonable length (normally not over six hundred feet) will be approved where necessitated by topography or where, in the opinion of the Commission, they are appropriate for the type of development contemplated.
(3) Proposed streets shall intersect one another as nearly at right angles as topography and other limiting factors of good design permit.
(4) Where there exists adjacent to the tract to be subdivided a dedicated or platted and recorded half-width street or alley, the other half-width of such street or alley shall be platted.
(5) Alleys shall be platted in all business districts. To provide safe access to residential lots fronting on thoroughfares, major streets and parkways, alleys shall be platted in the rear of such lots or service drives provided in front thereof. Alleys will not be approved in other locations in residence districts, unless required by unusual topography or other exceptional conditions.
(6) Lands abutting highways or principal thoroughfares should be platted with the view of making the lots, if for residential use, desirable for such use by cushioning the impact of heavy traffic on such trafficways, and with the view of minimizing interference with traffic on such trafficways as well as the accident hazard. This may be accomplished in several ways, as follows:
A. By platting the lots abutting such trafficways at very generous depth, and by providing vehicular access to them by means of either alleys or service drives in the rear, or frontage access roads next to the highway, connected therewith at infrequent intervals.
B. Another more desirable and usually more economical method consist of not fronting the lots on the highway but on a minor street paralleling the highway at a distance of a generous lot depth. Private driveways in this case would, of course, connect with such minor street.
C. Under still another scheme, a collector street may be platted more or less parallel with the highway, six hundred feet to one thousand feet distant therefrom, from which loop streets or dead-end streets would extend toward the highway, the ends of which give access to the lots abutting the highway to their rear.
Selection, in a specific case, among the foregoing or other methods for accomplishing the purposes in view must necessarily be made in consideration of topography and other physical conditions, the character of existing and contemplated developments and other pertinent factors that apply in each case.
(7) Subdivisions abutting a stream or lake shall provide roads providing access to the low water mark, so that there will be roads at one-half mile intervals as measured along the stream or lake shore.
(b) Blocks shall have sufficient width to provide for two tiers or lots of appropriate depth.
(1) The lengths of blocks shall be such as, in the opinion of the Commission, are appropriate for the locality and the type of development contemplated, but shall not exceed eighteen hundred feet where the average size of lots does not exceed two acres in area.
(2) In any block over nine hundred feet in length, the Commission may require that a crosswalk or pedestrian way, not less than ten feet wide, be provided near the center and entirely across such block.
(3) The number of intersecting streets along highways, thoroughfares and parkways shall be held to a minimum. Wherever practicable, blocks along such trafficways shall not be less than twelve hundred feet in length.
(11-4-85, appx. II.)