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The Western Cooperative Test Group is dedicated to providing information and assistance to promote mutual understanding between users and producers of asphalt materials. Additionally, they aim to improve the utilization of standardized testing of asphalt materials. They also want to provide a forum for meaningful discussion and interpretation of current and new test specifications, procedures, and equipment for various asphalt materials.

The Group was originally formed in the 1960's with the Wyoming Highway Department Materials Testing Laboratory and several of the asphalt refineries in Wyoming. The Group has since grown to 54 member labs. Most of these are located in the Rocky Mountain region, with the full membership including labs across the continental USA (Canada to Texas, also includes two labs in Central America).