Highlights and Changes in NHTSA's Real-World Data Collection for Rollover Crashes

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1 Highlights and Changes in NHTSA's Real-World Data Collection for Rollover Crashes Carl Ragland SCI Team Leader SAE Government Industry Meeting May 9, 2006 NHTSA s National Center for Statistics & Analysis 1

2 Outline Overview of NASS data collection Rollover data and changes for 2006 SCI focus Sample rollover case NHTSA s National Center for Statistics & Analysis 2

3 NASS CDS National Automotive Sampling System - Crashworthiness Data System Statistically based Not biased for rollover cases Good level of detail Valuable for making national projections NHTSA s National Center for Statistics & Analysis 3

4 SCI Special Crash Investigations Not statistically based Targets specific crashes Excellent level of detail Valuable for understanding specific vehicle/equipment behavior NHTSA s National Center for Statistics & Analysis 4

5 NMVCCS National Motor Vehicle Crash Causation Survey Statistically based No specific rollover focus On-scene and focused on pre-crash Valuable to understand factors contributing to crash/rollover NHTSA s National Center for Statistics & Analysis 5

6 New Rollover Variables for 2006 Pre-Rollover maneuver: The last controlled maneuver prior to the initiation of the rollover. Interrupted Roll : Yes/No if a roll sequence was interrupted by an object. Estimated distance from trip point to final rest position : The purpose of this variable is to determine the estimated distance from tripping point to the final rest position of the vehicle that rolled over. Vertical and Lateral Maximum crush on the roof. The crush is measured in Green House only NHTSA s National Center for Statistics & Analysis 6

7 Example of New Rollover Data National Highway Traffic Pre-rollover maneuver The last controlled maneuver, relative to the roadway, prior to the initiation of the rollover. Attributes: Departing roadway (to paved surface) or (to unpaved surface) Returning to roadway (from paved surface) or (from unpaved surface) On roadway or Off roadway maneuver NHTSA s National Center for Statistics & Analysis 7

8 Example Rollover Data National Highway Traffic Attempted avoidance maneuvers Movements/actions initiated by subject driver within critical crash envelope in response to a Critical precrash event. After driver realizes impending danger Documents response to impending danger NHTSA s National Center for Statistics & Analysis 8

9 Example Rollover Data National Highway Traffic Location of rollover initiation Select the attribute which best describes the vehicle's location, relative to the roadway, at rollover initiation Attributes: On roadway On shoulder -paved On shoulder - unpaved On roadside or divided trafficway median Rollover - end-over-end NHTSA s National Center for Statistics & Analysis 9

10 Example Rollover Data Location on vehicle where initial tripping force is applied. Identify the specific point on the vehicle where the tripping force was applied. Attributes: Wheels Tires Side plane End plane Undercarriage Other location on vehicle (specify) Non-contact rollover forces (specify) Rollover - end-over-end NHTSA s National Center for Statistics & Analysis 10

11 MEASURE MAX CRUSH Vertical and Lateral NHTSA s National Center for Statistics & Analysis 11

12 MEASURE MAX CRUSH National Highway Traffic Exemplar Vertical and Lateral NHTSA s National Center for Statistics & Analysis 12

13 PILLAR AREAS National Highway Traffic A-pillar Area NHTSA s National Center for Statistics & Analysis 13

14 PILLAR AREAS National Highway Traffic B-pillar Area NHTSA s National Center for Statistics & Analysis 14

15 PILLAR AREAS National Highway Traffic C-pillar Area NHTSA s National Center for Statistics & Analysis 15

16 TOP PLANE AREAS Right Header Area Roof Area Left Header Area Left Back Light Header NHTSA s National Center for Statistics & Analysis 16

17 SCI 2006 Focus Related to Rollover Evaluate potential for ejection for vehicles with side curtains Gather all possible EDR and SDM downloads when rollover occurs Target vehicles with advanced passive and active safety technologies. NHTSA s National Center for Statistics & Analysis 17

18 SCI 2006 Focus Related to Rollover (cont d.) Electronic Stability Control Roll sensing Rollover curtain protection EDR downloads Crashworthiness NHTSA s National Center for Statistics & Analysis 18

19 Rollover Crash Example National Highway Traffic Curbed median ONLY 0 N 15' 0" 30' 0" Other vehicle: 2001 Saturn LT200 Other vehicle: 2001 Saturn LT200 STOP -0.9% grade SP EED LIMIT 30 Case Vehicle: 2003 Ford Expedition SPE ED LIMIT 40 Wall Case vehicle: 2003 Ford Expedition SUV +5.1% grade NHTSA s National Center for Statistics & Analysis 19

20 2003 Ford Expedition Collision Sequence Pre Impact: CV westbound at intersection at 40 mph Struck by a southbound vehicle on right side CV driver steered left and then corrected to right Crash Events: CV struck on right rear area and initiated a CW yaw Yawed 90 degrees to right Rolled left 5 quarter turns Came to rest on driver's side NHTSA s National Center for Statistics & Analysis 20

21 Overview of Occupants National Highway Traffic Driver: restrained 47-year-old male Rear left occupant: restrained 10-year-old male Rear middle occupant: restrained 8-year-old male NHTSA s National Center for Statistics & Analysis 21

22 Overview of Crash Scene NHTSA s National Center for Statistics & Analysis 22

23 Vehicle Exterior NHTSA s National Center for Statistics & Analysis 23

24 Right Outside View of Curtain National Highway Traffic NHTSA s National Center for Statistics & Analysis 24

25 Left Outside View of Curtain National Highway Traffic NHTSA s National Center for Statistics & Analysis 25

26 Injuries None NHTSA s National Center for Statistics & Analysis 26

27 Questions National Highway Traffic??? NHTSA s National Center for Statistics & Analysis 27

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