Lots in subdivisions shall have a minimum frontage and a minimum depth in accordance with the zoning regulations.

Insofar as is practical, side lot lines shall be at right angles to straight streets and radial to curved streets.

Each lot must front upon an approved and installed street.

Where extra width has been dedicated for the widening of existing streets, lots shall begin at such extra-width lines, and all setbacks shall be measured from such lines.

Where there is a question as to the suitability of a lot or lots for their intended use due to factors such as rock formations, flood conditions or similar circumstances, the Planning Board may, after adequate investigation, withhold approval of such lots.