Transportation Conformity: A Basic Guide for State & Local Officials

Transportation Conformity Process for Metropolitan Transportation Plans/TIPs

Plan/Tip conformity requiring a new regional emissions analysis

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Ensure timely implementation of SIP TCM's, fiscal constraint, etc.

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Conduct regional emissions analysis using latest planning assumptions and emissions model

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Are there adequate approved SIP budgets?

• If YES go to "Use budget test"

• If No go to "Use interim emissions test(s)"

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Is conformity test met?

• If YES continue

• If No go to "Revise plan/TIP (or SIP budgets if applicable)"

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Meets all other requirements (e.g., public involvement)

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Complete Plan/TIP conformity determination

Transportation Conformity Process for Projects

Is project a non-exempt Federal Project?

• If YES continue

• If No go to "Project-level conformity not required"

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Does the project come from a conforming plan and TIP? (Note: does not apply to donut or isolate rural areas)

• If YES continue

• If no go to "Revise plan/TIP (or Sip budgets if applicable)"

Is the project in a CO and/or PM area?

• If YES continue

• If no go to "Meet other project-level conformity requirements (e.g., compliance with control measures in PM areas)"

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Is hot-spot analysis required?

• If YES continue

• If No go to "Meet other project-level conformity requirements (e.g., compliance with control measures in PM areas)"

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Perform hot-spot analysis

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Are hot-spot requirements met?

• If YES continue

• If No go to "Add mitigation, etc."

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Meet other project-level conformity requirements (e.g., compliance with control measures in PM areas)

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Complete project-level conformity determination

Key interagency points are in bold.