Commercial Driver's License (CDL) Cargo Handling and Hazardous Materials Syllabus

Cargo Handling and Hazardous Materials syllabus — full chapter and topic list

Expand any chapter to see its topics and sub-topics. This is the whole examinable outline for Cargo Handling and Hazardous Materials in Commercial Driver's License (CDL), not a summary of it.

1. 1

   Cargo Securement and Weight Distribution

   4 topics

   • Legal weight limits and axle weight distribution
   • Center of gravity and load stability
   • Securement systems and tiedowns
     • Working load limit and aggregate tiedown requirements
     • Blocking, bracing, and dunnage
   • Inspecting cargo en route and securing special loads
2. 2

   Tank Vehicles (N Endorsement)

   4 topics

   • Liquid surge and bulkheads vs. baffles
   • Outage and load stability in tanks
   • Driving tankers: high center of gravity handling
   • Inspecting tank components and special hauling rules
3. 3

   Hazardous Materials Basics (H Endorsement)

   4 topics

   • Hazard classes and divisions
   • Shipping papers and the Hazardous Materials Table
   • Placarding and marking requirements
     • When placards are required
     • Placard placement and visibility
   • Security awareness and the HazMat regulations system
4. 4

   HazMat Loading, Transport, and Emergencies

   4 topics

   • Loading and unloading safety rules
   • Routing, attendance, and parking restrictions
   • Emergency Response Guidebook and incident procedures
   • Reporting accidents, spills, and leaks

Cargo Handling and Hazardous Materials flashcards for Commercial Driver's License (CDL)

18 of 52 cards from the Cargo Handling and Hazardous Materials deck — real questions with worked answers.

1. What is the maximum gross vehicle weight (GVW) allowed on the Interstate Highway System for a typical 5-axle combination?

   80,000 pounds.

2. What are the federal maximum weight limits for a single axle and a tandem axle group?

   20,000 lb on a single axle; 34,000 lb on a tandem axle group.

3. What is the federal Bridge Formula used to determine?

   The maximum weight allowed on any group of axles based on the number of axles and the distance (spacing) between them — wider spacing and more axles allow more weight.

4. Define gross vehicle weight (GVW) versus gross combination weight (GCW).

   GVW is the total weight of a single vehicle plus its load; GCW is the total weight of a powered unit plus trailer(s) plus the cargo.

5. What is the difference between GVWR and GAWR?

   GVWR (Gross Vehicle Weight Rating) is the maximum a single vehicle can weigh as set by the manufacturer; GAWR (Gross Axle Weight Rating) is the maximum a single axle system can carry.

6. Why must cargo weight be distributed properly across the axles?

   Overloading an axle can damage the vehicle and the road, and uneven distribution affects steering, traction, and braking, making the vehicle harder to control.

7. What is a vehicle's center of gravity and why does it matter for cargo?

   The center of gravity is the point where the vehicle's weight is balanced; a high center of gravity makes the vehicle more likely to tip over, especially in curves and quick lane changes.

8. How should heavy cargo be loaded relative to a vehicle's center of gravity?

   Heavy cargo should be loaded low (not stacked high) and spread out, keeping the center of gravity low to reduce rollover risk.

9. What can happen if cargo is loaded with too much weight to one side?

   It can make the vehicle prone to rollover, cause poor handling, and may lead to tire failure on the overloaded side.

10. What is the minimum number of tiedowns required for any cargo, regardless of length?

    At least one tiedown for every 10 feet of cargo, with a minimum of 2 tiedowns no matter how short the article is.

11. For cargo longer than 5 feet and over 1,100 lb, how many tiedowns are required?

    At least 2 tiedowns; cargo over 10 feet requires 2 for the first 10 feet plus 1 additional tiedown for each additional 10 feet or fraction thereof.

12. What is the aggregate working load limit (WLL) requirement for cargo securement?

    The combined working load limit of all tiedowns must be at least half (50%) of the weight of the cargo being secured.

13. What are blocking and bracing used for in cargo securement?

    Blocking and bracing are used in front of, behind, and/or around cargo to prevent it from sliding, tipping, or shifting during transport.

14. What securement devices are commonly used as tiedowns?

    Chains, straps (web straps), wire rope, steel strapping, and cordage, along with binders, anchor points, and edge protectors.

15. When inspecting cargo en route, how soon must the first cargo check be made and how often after?

    Inspect within the first 50 miles, then re-check every 3 hours or 150 miles, and after every break or change of duty status.

16. What securement rule applies to hauling logs, metal coils, or other special heavy loads?

    They are subject to commodity-specific securement rules in the Federal Motor Carrier Safety Regulations specifying tiedown count, blocking, and chocking methods for each commodity type.

17. What is liquid surge in a tanker and why is it dangerous?

    Liquid surge is the back-and-forth wave action of liquid in a partially filled tank; it can push the truck in the direction the liquid moves, affecting control when stopping or starting and causing skids or loss of control.

18. What is the difference between a bulkhead and a baffle in a liquid tank?

    A bulkhead is a solid divider that separates the tank into smaller compartments; a baffle is a divider with holes that lets liquid flow through while slowing the surge.

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