Tag Archives: Passenger Compartment Intrusion

NTSB Preliminary Report: Box Truck Overrode Van Killing Eight

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The newly-released NTSB preliminary report describes June 3, 2019, Mississippi box truck/van crash with 8 fatalities: right front of the truck hit the right front of the van head-on. The truck OVERRODE the front of the van & penetrated the passenger compartment. Deadly PCI (Passenger Compartment Intrusion) occurred.

The driver of the van sat in a part of the van which did not go under the truck — no PCI (just like me). He walked away with minor injuries. The eight other van occupants all suffered fatal injuries.

Read it here. NTSB Preliminary Report, July 24, 2019: https://www.ntsb.gov/investigations/AccidentReports/Pages/HWY19FH009-preliminary-report.aspx

On October 21, 2010, the NTSB issue a Truck Underride Safety Recommendation based upon the investigation of a 2009 crash in which a truck overrode 3 cars and 10 people died as a result. The Recommendation reads like this:

Since 2003, European Union countries have required front underride protection systems on all newly manufactured heavy-goods vehicles, which indicates that such a standard is feasible. The NTSB concludes that collisions between passenger vehicles and the front of single-unit trucks or tractor-trailers are common types of crashes that result in fatalities, and front underride contributes to crash severity. The NTSB therefore reiterates its prior recommendations that NHTSA. . . require all newly manufactured trucks with gross vehicle weight ratings over 10,000 pounds to be equipped with front underride protection systems. . .

That was 9 years ago. Tell me, how many people could still be alive today had NHTSA acted upon that safety recommendation? Congress, I’ll say it again: the ball is in your court. Will you act decisively to STOP all forms of truck underride? Front, side, rear, tractor-trailer, single-unit truck, passenger vehicle, pedestrian, cyclist, motorcyclist.

June 26, 2009 front override crash near Miami, Oklahoma. Investigated by the NTSB

STOP Underrides! Petition to Congress: https://www.thepetitionsite.com/104/712/045/congress-act-now-to-end-deadly-truck-underride/

Another Successful TrailerGuard System Safety Skirt Crash Test : No Passenger Compartment Intrusion

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On Saturday, June 2, 2018, Aaron Kiefer’s volunteer crew of crash testers, conducted another round of crash testing with his TrailerGuard System consisting of a polyester webbing Safety Skirt connected to his aluminum Rear Reinforcement Attachment (which strengthens the existing rear underride guard).

Crash Test #1 showed some Passenger Compartment Intrusion (PCI), which means the people in the car would have been injured. Analysis of the results showed that the webbing was likely too low and not able to catch the car.

Crash Test #2, on the other hand, was very successful: no PCI. The car was damaged from the collision but did not go under the trailer and rebounded back. 35 mph Delta-V force, 31 mph impact speed

Aerial view from a drone:

Q. What does it mean that the air bags did not deploy?

A. The acceleration was low enough that the car decided that it didn’t need them. So the crash pulse was “long” due to the flexibility/energy absorbing of the webbing. According to the air bag control module report, the car deployed the driver seat and passenger seat belt pretensioners. However, the severity of the crash was judged below the threshold to require the frontal air bags. This is due to the fact that the deceleration was achieved over a long duration (over 200 ms) and that the decleration rate was low.
Q. So, how would occupants have fared?
A. The occupants would have been fine in this 30+ mph collision since PCI was avoided and the energy was absorbed by the webbing and the vehicle structure. the threshold for air bag deployment of a vehicle of this type striking a solid object is 10-15 mph.
Crash testing — especially without the backing of corporate R&D resources — is time-consuming but well worth the effort. Imagine where we would be in terms of preventing devastating truck underride if we all collaborated to get the job done!

A real-life crash between a semi-trailer & 2 cars shows the life & death difference which underride makes.

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A real life crash, where two cars collided with a semi-trailer, occurred in the Chicago area on October 16, 2017. One driver died; the other driver survived.

The 38-year-old driver of the Jaguar and the 27-year-old driver of the semi-tractor were each transported to area hospitals with non-life threatening injuries. The driver of the Envoy was pronounced deceased at the scene. 2 Dead, 1 Critically Injured in Aurora Crash Involving Semi

I don’t have proof yet, but it appears to me that the driver who survived may have done so because his car (the white Jaguar) hit the trailer tires, which activated the crush zone of the car and prevented underride ( or Passenger Compartment Intrusion = PCI). The driver of the other car was not so fortunate, the first point of impact was probably in his occupant space.