DOT Cheat Sheet 2026

The 30 highest-yield DOT facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which of the following vehicles is required to use an ELD under current FMCSA rules? → A Class 8 truck operated in interstate commerce with a driver required to keep RODS
2. Safety devices such as rear-view mirrors may extend beyond the 102-inch width limit by up to how much on each side? → 6 inches per side
3. Which standard of practice is MOST important for ensuring quality in Hazardous Materials Transportation? → Following evidence-based protocols while adapting to specific circumstances
4. What is the PRIMARY purpose of continuing education requirements in Hours of Service Regulations for DOT professionals? → Maintaining current knowledge and competency as the field evolves
5. How should loose cargo be handled during inspection? → Secured with proper restraints
6. Which standard of practice is MOST important for ensuring quality in Cargo Securement Requirements? → Following evidence-based protocols while adapting to specific circumstances
7. What should be done if a defect is found during a pre-trip inspection? → Repair the defect before operating
8. Which federal agency maintains the official registry of certified ELD devices? → Federal Motor Carrier Safety Administration (FMCSA)
9. A 'grandfather' provision in federal size and weight law allows: → States to permit vehicle configurations that were legal before federal limits were enacted
10. In Accident Investigation & Reporting, what is the FIRST step a DOT professional should take when encountering a new case or situation? → Conduct a comprehensive assessment and gather all relevant information
11. What is the PRIMARY purpose of continuing education requirements in Accident Investigation & Reporting for DOT professionals? → Maintaining current knowledge and competency as the field evolves
12. When a conflict arises between standard procedures and a unique situation in Commercial Vehicle Inspection Standards, what should a DOT professional prioritize? → Safety and ethical obligations while seeking expert consultation
13. At a permanent weigh station, the primary tool used to definitively verify axle weights for enforcement purposes is: → A certified static scale
14. What is the maximum vehicle width permitted on federal-aid highways under federal regulations? → 102 inches
15. Which document provides proof of annual DOT vehicle inspection? → Annual inspection report or sticker
16. What is the PRIMARY purpose of continuing education requirements in Drug & Alcohol Testing Programs for DOT professionals? → Maintaining current knowledge and competency as the field evolves
17. What is the purpose of Hours of Service (HOS) regulations? → To prevent driver fatigue
18. What is the primary consequence for states that fail to enforce federal vehicle size and weight standards? → Loss of federal highway funding
19. Which standard of practice is MOST important for ensuring quality in Drug & Alcohol Testing Programs? → Following evidence-based protocols while adapting to specific circumstances
20. When a conflict arises between standard procedures and a unique situation in Drug & Alcohol Testing Programs, what should a DOT professional prioritize? → Safety and ethical obligations while seeking expert consultation
21. Which is a common hazard related to vehicle lighting systems? → Malfunctioning brake or signal lights
22. When using a portable scale to weigh a commercial vehicle at roadside, which practice produces the most accurate and legally defensible result? → Use the scale on a level surface following manufacturer calibration procedures
23. What does a loose or broken U-bolt indicate during inspection? → A potential safety hazard
24. Which standard of practice is MOST important for ensuring quality in Commercial Vehicle Inspection Standards? → Following evidence-based protocols while adapting to specific circumstances
25. What safety equipment should be inspected before a trip? → Safety equipment like fire extinguishers
26. In Commercial Vehicle Inspection Standards, what is the FIRST step a DOT professional should take when encountering a new case or situation? → Conduct a comprehensive assessment and gather all relevant information
27. Which of the following vehicle types is typically exempt from federal length limitations under the STAA? → Automobile transporters
28. Under what condition may a driver use paper logs instead of an ELD during a roadside inspection? → When the ELD has malfunctioned and is within the 8-day repair window
29. Under 23 CFR Part 658, which road network is required to accommodate vehicles meeting federal size and weight standards? → The National Network of designated highways
30. Which part of the Code of Federal Regulations (CFR) contains DOT rules for commercial drivers? → Title 49