In order to help transportation agencies better understand TPM federal regulations and requirements, USDOT and FHWA have created the video series, "TPM Essentials." The series comprises 18 short clips; each focuses on a specific aspect of federal TPM. The entire series can be found on FHWA's website here or on Youtube here.

This clip from the series focuses on applicability determination for on-road mobile source emission measures outlined by the system performance rule known as PM3. The video provides answers to the following three questions related to this topic:

• How is applicability determined?
• What actions are required
• How does it fit with the TPM timeline?