In March 2012, the National Transportation Product Evaluation Program (NTPEP) approved the adoption of the Work Plan for the evaluation of geotextile materials in highway applications. The purpose of the NTPEP work plan is to establish a list of manufacturing facilities, private label companies, geotextile converters and their associated geotextile products that conform to the quality control and product testing requirements of the work plan and the American Association of State Highway and Transportation Officials (AASHTO) specification M-288.

Geotextiles (GTX) 

DOT Acceptance - Specification and Policy Language

NTPEP Site and Work PlanALDOT Letter
GMA LetterALDOT Specifications
NTPEP Announcement LetterNCDOT Letter

NHDOT Letter