An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Verified Technologies for SmartWay and Clean Diesel

Overview of the SmartWay Verification Process for Aerodynamic Devices

The SmartWay Verification Program evaluates the ability of trailer devices to reduce drag and improve fuel economy for Class 8 tractor-trailers.

  • Due to the complexity of the verification process, EPA cannot guarantee specific time frames for completion.
  • Manufacturers can expedite the process by providing immediate and thorough responses to all EPA inquiries.

There are five parts to this process:

Part 1: Requirements

Make sure you meet the device eligibility requirements before applying.

Part 2: Application

Fill out the web form completely.

Part 3: Device Info

After completing the webform, start preparing the following for your device: description, engineering drawings, test data, and in-use experience. EPA will contact you with instructions for submission.

Part 4: Testing

Testing consists of selecting a test facility, developing a test plan, and working with EPA to ensure the quality of the testing. Please DO NOT conduct verification testing without EPA approval.

Part 5: Evaluation

Evaluation includes reviewing the verification test data and if satisfactory, issuance of a Verification letter, and addition to the Verified List.