Find a regulation

Start with a CFR citation or the problem you need to understand. These directories connect the controlling source, the facts to establish, and related questions.

Search all 1441 question pages · Ask a regulatory question

Browse by CFR topic

• 49 CFR Part 395: Hours of service

  Find hours-of-service rules, official CFR sections, ELD questions, and source-checked guides to the driving limits and 30-minute break.

• 49 CFR Part 391: Driver qualification

  Browse driver qualification, qualification-file and medical-examination questions with direct links to federal sources.

• 49 CFR Part 396: Vehicle inspection and maintenance

  Find official vehicle inspection, maintenance, DVIR and periodic-inspection sections and related regulatory questions.

• 49 CFR Part 382: Drug and alcohol testing

  Browse motor-carrier drug and alcohol testing sources, random-testing questions and applicable testing categories.

• 49 CFR Part 172: Hazmat communication and training

  Find hazardous-materials table, shipping-paper, marking, labeling, placarding and training sources with related questions.

• 29 CFR 1910.134: Respiratory protection

  Start with OSHA's respiratory protection standard and find program, respirator-selection, fit-testing and training questions.

• 40 CFR Part 112: Oil pollution prevention and SPCC

  Find the federal oil-pollution prevention rule, SPCC applicability sources and questions about facility planning.

• 15 CFR Part 736: Export Administration Regulations prohibitions

  Browse the EAR general prohibitions and export-control questions with direct federal source links.

More regulatory questions

The question library also includes customs and tariffs, FDA, employment, state rules, and other topics. Learn how we handle sources before relying on generated guidance.