Amends GS 136-44.50 concerning the Transportation Corridor Official Map Act, providing a new requirement, that before any property can be regulated pursuant to the Transportation Corridor Official Map Act, that a preferred alternative for the corridor must be selected and identified in the final environmental impact statement filed in accordance with the National Environmental Policy Act.

Deletes GS 136-44.50(d), provisions concerning environmental impact studies and requiring that work on an environmental impact statement or preliminary engineering must begin within one year after the establishment of a transportation corridor official map or amendment.

Enacts new GS 136-44.50(d1) providing that failure to begin construction of a corridor within ten years of the establishment of a transportation corridor official map constitutes an abandonment of the corridor, ending the application of the provisions of the Transportation Corridor Official Map Act to properties within the corridor. Makes organizational and conforming changes. 

Amends GS 136-44.51 to provide that applications for building permits or plat approval subject to a transportation corridor official map cannot be delayed for more that two years (was, three years) from the date of their original submittal. Makes conforming changes.

Amends GS 136-44.53(a), making conforming changes concerning the new provisions in GS 136-44.50.

Effective when the act becomes law, applying to maps filed before, on, or after that date.