| NTSB Recommendations: Hazmat | |
| PHMSA is required by law to respond to recommendations issued by NTSB. |
| NTSB Recommendations: Pipeline | |
| PHMSA is required by law to respond to recommendations issued by NTSB. |
| Preemptions: Hazmat | |
| A preemption is the displacing effect that Federal law has on a conflicting or inconsistent local or state law. |
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