; (5) the term curbside delivery means a primary mode of mail delivery whereby a mail receptacle is situated at the edge of a sidewalk abutting a road or curb, at a road, or at a curb, and can be served by a letter carrier from a motorized vehicle; and (6) the term sidewalk delivery means a primary mode of mail delivery whereby a mail receptacle is situated at the edge of a sidewalk and can be served by a letter carrier from the sidewalk. (b) Policy It shall be the policy of the Postal Service— (1) to provide access to secure, convenient mail and package delivery receptacles to the greatest number of postal patrons feasible; and (2) to use the most cost-effective primary mode of mail delivery feasible for postal patrons. (c) Phaseout of door delivery for new addresses (1) In general For any new delivery point established after the date of enactment of the Postal Service Reform Act of 2018 , the Postal Service shall provide a primary mode of mail delivery other than door delivery, with a preference for secure, centralized delivery. (2) Exception Paragraph (1) shall not apply in circumstances in which the new delivery point is built or established within a block of existing delivery points whose primary mode of mail delivery is door delivery. (d) Business address conversion (1) Identification Not later than 1 year after the date of the Postal Service Reform Act of 2018 , each Postal Service district office shall identify the business delivery points within its service area that are appropriate candidates for conversion from door delivery to centralized delivery, curbside delivery, or sidewalk delivery. (2) Conversion requirement Beginning not later than October 1, 2019, the Postal Service shall implement a program to convert delivery points identified under paragraph (1) to centralized delivery, curbside delivery, or sidewalk delivery at a rate sufficient to ensure that— (A) not less than 20 percent of such delivery points are converted by September 30, 2019