Background to NHTSA NCAP Ratings for Rollover Resistance Why
are they based on Static Stability Factor?
Slide 2
Criticism of Rollover Ratings Vehicle properties have little
effect Static Stability Factor (SSF) is too simplistic SSF does not
reward Electronic Stability Control (ESC) Rollover ratings should
be on dynamic tests Rollover ratings will confuse customers
Slide 3
What This Presentation Addresses Why we think vehicle
properties affect rollover Requirements for a rollover rating
system Evaluation of several laboratory metrics Our measure of
rollover risk ro/svc The problem of rewarding ESC Observations
about dynamic maneuver tests
Slide 4
Overview of Vehicle Effect
Slide 5
Slide 6
Requirements for Rollover Rating System Represent tripped and
untripped rollovers Correlation with rollover crash statistics
Clear causal relationship to rollover Objective and repeatable
measurements Low potential for unintended consequences
Understandable by consumers
Slide 7
Tripped and Untripped Rollover 82% of Rollovers are in SVC 95%
are tripped (curb, soft soil, ditch, guard rail, side slope, rim
dig, etc.)
