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Tactile Vibrating Toolkit and Driving Simulation Platform for Driving-Related Research

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Is passenger vehicle incompatibility still a problem?

Eric R Teoh¹, Joseph M Nolan

¹Insurance Institute for Highway Safety, Arlington, Virginia 22201, USA. eteoh@iihs.org

Traffic Injury Prevention

|November 10, 2012

Summary

Vehicle compatibility improvements, particularly with sport utility vehicles (SUVs) and pickups, have reduced car crash fatalities. Voluntary industry changes have made passenger vehicles safer in collisions.

Area of Science:

Traffic Safety
Automotive Engineering
Accident Analysis

Background:

Passenger cars face disadvantages in collisions with heavier light trucks (SUVs and pickups) due to mass, structural alignment, and stiffness differences.
Voluntary industry measures were implemented in 2003 to enhance vehicle compatibility in crashes, with full adherence by 2009.

Purpose of the Study:

To evaluate the effectiveness of voluntary vehicle compatibility measures by examining fatality rates before and after implementation.
To determine if observed reductions in crash fatalities align with the expected benefits of improved vehicle compatibility.

Main Methods:

Analyzed occupant death rates and car crash partner death rates for passenger cars, SUVs, and pickups in the US during 2000-2001 and 2008-2009.
Calculated death rates per million registered vehicle years, stratified by vehicle type and curb weight.

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Examined car crash partner death rates specifically for front-to-front and front-to-side collisions.

Main Results:

Occupant death rates generally decreased over time and with increasing vehicle weight for all types; SUVs showed the most significant declines.
Car crash partner death rates declined across all vehicle categories, with steeper reductions observed for SUVs and pickups colliding with cars.
By 2008-2009, car crash partner death rates for SUVs and cars were nearly identical, indicating improved compatibility.

Conclusions:

While isolating the exact impact of the compatibility agreement is challenging, larger reductions in car crash partner death rates for SUVs and pickups suggest its benefits.
The findings indicate that the combined system of regulatory testing, voluntary initiatives, and consumer information has successfully improved overall passenger vehicle crash compatibility.
The study highlights the positive outcomes of industry-wide efforts to create a safer vehicle fleet.