No lot which conforms to the requirements of this chapter governing minimum lot width, depth or area shall be deemed or considered to be nonconforming where such nonconformity is created solely by virtue of dedication to the Township, the County, or the State, of land for a street, avenue or road, sewer or drainage easement; provided, that the width, depth or lot area remaining is not less than 80% of the requirements of this chapter; and provided, further, that this section shall not apply where such dedication is made pursuant to the land subdivision ordinance in connection with the subdivision of lands into three or more lots or in connection with the dedication of a new street.