The block length, width, and acreage within bounding roads shall be such as to accommodate the size and dimensions of lots required for the zoning district by this chapter and to provide for convenient access, circulation control, and safety of vehicles and pedestrians.

Block lengths may vary between 500 and 3,000 feet but blocks along other than local or collector streets shall not be less than 1,200 feet long.

Interior crosswalks with a right-of-way 20 feet wide containing a sidewalk of four feet or greater in width and fenced on both sides may be required for blocks longer than 1,200 feet, from the ends of the cul-de-sacs to adjacent streets and elsewhere as required by the public convenience, including the provision of walks giving access to schools, playgrounds and shopping centers without the necessity of crossing traffic thoroughfares.