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    • Hazardous Materials Safety Interpretations

    Metadata Updated: July 31, 2025

    The Pipeline and Hazardous Materials Safety Administration, Office of Hazardous Materials Safety (OHMS) provides written clarifications of the Hazardous Materials Regulations (HMR; 49 CFR Parts 100-185) in the form of interpretation letters. These letters reflect the agency's current application of the HMR to the specific facts presented by the person requesting the clarification. Interpretations are one form of Guidance provided by OHMS.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: us-pd

    Downloads & Resources

    References

    https://portal.phmsa.dot.gov/ocfrTool/interpretations

    Dates

    Metadata Created Date November 12, 2020
    Metadata Updated Date July 31, 2025
    Data Update Frequency irregular

    Metadata Source

    Harvested from DOT Socrata Data.json

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date November 12, 2020
    Metadata Updated Date July 31, 2025
    Publisher Pipeline and Hazardous Materials Safety Administration
    Maintainer
    Identifier DOT-327
    Data First Published 2011-01-18
    Language en-US
    Data Last Modified 2025-07-30
    Category Transportation
    Public Access Level public
    Data Update Frequency irregular
    Agencydataseriesurl https://portal.phmsa.dot.gov/ocfrTool/interpretations
    Agencyprogramurl https://portal.phmsa.dot.gov/ocfrTool/interpretations
    Analysisunit Regulated Entity
    Bureau Code 021:50
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://data.transportation.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Categorydesignation Research
    Collectioninstrument Transportation
    Data Quality True
    Harvest Object Id b10b30a3-fae9-4711-93bf-d64a872c9b5f
    Harvest Source Id a776e4b7-8221-443c-85ed-c5ee5db0c360
    Harvest Source Title DOT Socrata Data.json
    Homepage URL https://data.transportation.gov/d/pwdf-sj2q
    License http://www.usa.gov/publicdomain/label/1.0/
    Phone 202-366-4308
    Program Code 021:000
    Related Documents https://portal.phmsa.dot.gov/ocfrTool/interpretations
    Source Datajson Identifier True
    Source Hash 3e598b6897bba80c78327458686332a0c6a7558b3b9d7b843a0bdd17f19613ff
    Source Schema Version 1.1
    Temporal 1995-01-01/2011-01-18

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