Programs that work for you

"They are rigorous, they’re about making sure our labs, personnel, and test methods conform, that they’re in compliance. They’re independent, not driven by a vendor or a construction company.”

California Department of Transportation

Philip Stolarski, Former Deputy Division Chief, DES-METS & GS

55+	years of experience
3,000+ PSP participants
23,000+ samples shipped per year
1,000 laboratory assessments per year
2,000+ accredited labs

News

Policy Update: Use of Ratings from Non-Consecutive Rounds

Aug 25, 2025

The AASHTO Accreditation Program has clarified its suspension policy regarding consecutive low ratings when current round ratings are suppressed. For example, since ratings for the 2025 Hot Mix Gyratory Proficiency Samples were suppressed, the 2024 and 2026 results will be used to determine any potential suspensions.

Please see the following policy and guidance documents for more information on proficiency sample rules: