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Assessment of Collision Markings on Non-Used Vehicle Seat Belt Restraint Systems
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
Annotation ability available
Forensic investigators of automobile collisions are commonly tasked with determining whether physical evidence observed on restraint systems is consistent with the occupant’s use or non-use of the seat belt restraint. The characteristics of collision-induced markings generated on seat belt systems are not solely dependent on the belted status of the occupant, but also the technological features incorporated in the seat belt assembly. As the state-of-the-art for seat belt assemblies has changed over time, so has the constellation of physical evidence typically created on seat belt restraint systems. Pretensioner deployment can leave physical evidence on restraint system hardware in the absence of occupant loading. This study presents examples of physical evidence collected from seat belt systems involved in real-world collisions, which were initially alleged to affirm proper belt use, but were ultimately proven to be evidence of non-use. Several laboratory demonstrations were conducted to investigate physical evidence created on restraint system hardware as a result of pretensioner deployments of non-used seat belts in a variety of incompletely stowed conditions. The demonstrations show the initial positions of the seat belt assemblies necessary to produce the distinct physical evidence documented in the real-world samples. The physical evidence observed on the real-world restraint systems were consistent with the markings produced in the laboratory demonstrations. The presence of physical evidence on restraint system hardware and webbing is inadequate to conclude that a seat belt restraint was in use. Careful consideration of restraint system physical evidence combined with restraint system geometry and incorporated technological features can distinguish physical evidence related to seat belt use or non-use during a collision event. These examples will be useful to investigators for the assessment of physical evidence and diagnosis of seat belt use.
CitationGregg, R. and Petroskey, K., "Assessment of Collision Markings on Non-Used Vehicle Seat Belt Restraint Systems," SAE Technical Paper 2020-01-0975, 2020.
- Traffic Safety Facts 2016 , “A Compilation of Motor Vehicle Crash Data from the Fatality Analysis Reporting System and the General Estimates System,” National Highway Traffic Safety Administration, DOT HS 812 554, May 2018.
- “Fatality Reduction by Safety Belts for Front-Seat Occupants of Cars and Light Trucks: Updated and Expanded Estimates Based on 1986-99 FARS Data,” National Highway Traffic Safety Administration, DOT HS 809 199, December 2000.
- Moffatt, C.A., Moffatt, E.A., and Weiman, T.R. , “Diagnosis of Seat Belt Usage in Accidents,” SAE Technical Paper 840396, 1984. https://doi.org/10.4271/840396.
- Gorski, Z.M., German, A., and Nowak, E.S. , “Examination and Analysis of Seat Belt Loading Marks,” Journal of Forensic Sciences 35(1), January 1990.
- Bready, J.E., Nordhagen, R.P., and Kent, R.W. , “Seat Belt Survey: Identification and Assessment of Noncollision Markings,” SAE Technical Paper 1999-01-0441, 1999. https://doi.org/10.4271/1999-01-0441.
- Bready, J.E. et al. , “Characteristics of Seat Belt Restraint Systems Markings,” SAE Technical Paper 2000-01-1317, 2000. https://doi.org/10.4271/2000-01-1317.
- Heydinger, G.J., Uhlenhake, G.D., Guenther, D.A., and Dunn, A. , “Comparison of Collision and Noncollision Marks on Vehicle Restraint Systems,” SAE Technical Paper 2008-01-0160, 2008. https://doi.org/10.4271/2008-01-0160.
- Toomey, D.E., Klima, M.E., and Cooper, E.R. , “Evaluation of Seat Belt Assembly Physical Evidence in Properly Functioning and Intentionally Disabled Retractor Demonstrations,” SAE Technical Paper 2009-01-1245, 2009. https://doi.org/10.4271/2009-01-1245.
- Cromack, J.R., Schneider, D., and Blaisdell, D. , “Occupant Kinematics & Belt Marking in Crash Tests with Unrestrained and Partially Restrained Dummies,” in Association for the Advancement of Automotive Medicine, 34th Annual Proceedings, October 1990.
- Toomey, D.E., Van Ee, C., and Klima, M.E. , “Safety Restraint System Physical Evidence and Biomechanical Injury Potential due to Belt Entanglement,” SAE Technical Paper 2006-01-1670, 2006. https://doi.org/10.4271/2006-01-1670.
- Rapheal, E., Piziali, R., Le, H., Hinger, J. et al. , “Physical Evidence Associated with Seatbelt Entanglement during a Collision,” SAE Technical Paper 2007-01-1501, 2007. https://doi.org/10.4271/2007-01-1501.
- Burnett, R., Ballard, B., Marth, D., and Van Arsdell, W. , “Frontal Impact Rear Seatbelt Load Marks: An in-Depth Analysis,” SAE Technical Paper 2009-01-1249, 2009. https://doi.org/10.4271/2009-01-1249.
- Jakstis, M., Clyde, H., Hare, B., Landis, R., and Lewis, L. , “Marks on Seat Belt Systems with Pretensioners and Force Limiters in Airbag Deployment Crashes,” SAE Technical Paper 2009-01-1252, 2009. https://doi.org/10.4271/2009-01-1252.
- Jenkins, J.A., Steffens, C.E., and Turvill, W.W. , “Forensic Analysis of Seat Belt Retractor Torsion Bars,” SAE Technical Paper 2009-01-1242, 2009. https://doi.org/10.4271/2009-01-1242.