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Mod3 January 2015


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Mod3 January 2015

  1. 1. National Child Passenger Safety Certification Training Program Module 3 Injury Prevention & Crash Dynamics 3-1
  2. 2. 3-2 Module 3 Objectives • Describe challenges to crash survival. • Explain the concept of crash forces. • Describe five ways that car seats, booster seats, and seat belts prevent injury.
  3. 3. Challenges Related to Children, Car Seats, Booster Seats & Seat Belts • Car seat, booster seat, and seat belt use decreases as children get older (NHTSA, 2010). • According to various reports from NHTSA and the field, car seat, booster seat, and seat belt misuse rates vary from 74 to 90 percent. • Correct selection, installation, and use of a car seat can be challenging. 3-3
  4. 4. Challenges Related to Children, Car Seats, Booster Seats & Seat Belts (continued) • Caregivers may have outdated or incorrect information about car seats, booster seats, and seat belts. • Caregivers may not choose best practice over personal preferences or actual safety over perceived safety. 3-4
  5. 5. Fatalities are just the tip of the iceberg. • Many more injuries occur than deaths each year. • Some injuries have lifelong effects and can be costly. 3-5
  6. 6. Resources and Misuse Rates • Visit for a list of resources for current injury and child passenger safety data. • Misuse rates may vary widely, depending on the criteria in each study. • It is best to utilize local misuse data, if available. 3-5a
  7. 7. Factors Related to Injury Prevention Examples: • Road conditions before the crash • Car seat use during the crash • Seat belt use (such as using lap belt correctly or incorrectly) during the crash • Emergency response time after the crash 3-6
  8. 8. 3 Stages of a Collision 1. The vehicle crash: causes the vehicle to buckle and bend as it hits something and comes to an abrupt stop. 2. The human crash: occupants move toward the point of impact, at the vehicle’s original speed, until something stops their movement. 3. The internal crash: after the body comes to a complete stop, the internal organs are still moving forward until they hit something. 3-6a
  9. 9. 3 Stages of a Collision 3-7
  10. 10. Crash Forces Weight X Speed = Restraining Force • Vehicle going 40 mph would hit a tree with same force as hitting ground after falling off a 50-foot cliff • Person inside the vehicle would hit windshield with same force as hitting ground after a fall from a 5-story building 3-8
  11. 11. Practice Activity Estimating Restraining Force 3-8a 
  12. 12. Types of Crashes 3-9 • Frontal • Rear • Lateral/Side-impact • Rollover/Vault • Rotation/Spin • Ejection
  13. 13. 3-10 How Car Seats, Booster Seats & Seat Belts Prevent Injury • Keep people in the vehicle. • Contact the strongest parts of the body. • Spread forces over a wide area of the body. • Help the body to slow or "ride down" the crash forces. • Protect the head, brain, and spinal cord.
  14. 14. An occupant’s chance of survival increases dramatically when appropriately restrained. 3-11 Car Seats, Booster Seats, Seat Belts, and Air Bags = The Best Chance of Survival
  15. 15.  Progress Check Answer these questions in your TG: 1. What are two challenges related to children, crash survival and car seat, booster seat and seat belt use? 2. What are the three crashes involved in every vehicle collision? 3. What is the equation for estimating restraining force? 4. How much force would a 10-pound infant in a vehicle moving at 40 mph require to keep from moving forward? 5. What are the five ways car seats, booster seats, and seat belts help prevent or reduce injuries? 3-11a