Creates new GS 160D-804.2 (Temporary maintenance and acceptance guarantees), allowing counties to require developers to post a maintenance guarantee for any publicly dedicated roadway to be transferred for public maintenance under GS 136-102.6 or any municipal ordinance. Provides for the acceptable forms of guarantee including surety bonds and letters of credit, and establishes a maximum of 20% of the reasonably estimated cost of construction for the road or street secured by the guarantee. Specifies that the appropriate use of the guarantee is to ensure the road or street meets the minimum standards of the roadway’s administering entity prior to acceptance into the roadway system. Requires a county to petition the administering entity for road addition to its roadway system within five days of completed construction once the guarantee has been used. Requires the administering entity to automatically accept a road or street if it has not been accepted into the applicable roadway system for maintenance for four years after the plat has been recorded with the register of deeds. Outlines procedures for acceptance of the road or street and release of a guarantee, and legal responsibilities.