The width and alignment of all streets shall conform to the widths and alignments designated on the Official Plan, or Master Plan of Streets and Highways, as the same is shown at the time of filing the tentative map.
All streets as far as practicable shall be required to be in alignment with existing adjacent streets or their proper projection, and to be in general conformity with the Master Plan of Streets and Highways of the City; provided, that in cases where the holdings are large enough, a modified curved street layout may be required or permitted if such layout will not interfere with the general street plan and all boundary connections are made satisfactorily.
A minimum width of sixty feet shall be maintained on all streets unless it can be definitely shown that topography or local conditions will not permit such a width or that a lesser width is more suitable.
The street and alley arrangement shall be such as the Planning Board shall determine will cause no undue hardship to owners of adjoining property when they subdivide their land, and adequate and convenient access to adjoining property shall be required.
Dead-end streets and alleys shall be permitted only when the Planning Board shall determine a through street or alley is not practical and then only when adequate provisions are made at the end of the street or alley for drainage and for turning by providing a turning circle or by dedicating adequate space to facilitate backing and turning. Where a turning circle is provided, it shall have a minimum diameter of sixty feet.
At all block corners, rounding or cutting back at the property lines shall be required. The intersection corners on all major and secondary streets shall be rounded by curves having a minimum radius of twenty feet; all other corners shall be rounded by curves having a radius of fifteen feet. Where business development is anticipated, in order to simplify building construction, an optional method of a diagonal cut-off substantially equivalent may be used instead of rounding.