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Heavy Truck Aggressivity

Heavy Truck Aggressivity. Office of Research and Engineering. Heavy Truck Aggressivity. Defined as differences in Stiffness Geometry Weight Tractor trailer = almost 80,000 lbs Specialty bus = less than 14,000 lbs No U.S. requirements addressing heavy truck aggressivity

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Heavy Truck Aggressivity

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  1. Heavy TruckAggressivity Office of Research and Engineering

  2. Heavy Truck Aggressivity • Defined as differences in • Stiffness • Geometry • Weight • Tractor trailer = almost 80,000 lbs • Specialty bus = less than 14,000 lbs • No U.S. requirements addressing heavy truck aggressivity • Requirements for passenger cars

  3. Pre-Accident Post-Accident

  4. Large Truck Accidents • Not compatible with other vehicles • Almost 5,000 killed • Over 120,000 injured • 85% of fatalities in other vehicle • Heavy trucks aggressive to many vehicles

  5. Freightliner vs. Specialty Bus • Weight difference • Impact speed • Stiffness difference • Geometric mismatch • Leads to • Override and intrusion • Passenger deaths

  6. Reduced Aggressivity • European regulations • Front underride • Rear underride • Promising research • Energy-absorbing front structures • Bumpers designed as deflectors

  7. (Berg, Krehl, Riebeck, Breitling, Passive Safety of Trucks in Frontal and Rear-end Collisions with Cars, ESV 2003)

  8. Vehicle Incompatibility • NHTSA’s goal to reduce highway fatalities • Design initiatives necessary to reduce collision severity • Heavy trucks not included in research, testing for vehicle compatibility

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