Browse Publications Technical Papers 2020-01-1216

Evaluation of Laminated Side Window Glazing Coding and Rollover Ejection Mitigation Performance using NASS-CDS 2020-01-1216

This study analyses the effect of laminated glass using 1997-2015 NASS-CDS data. The validity of CDS coding in identifying laminated glass was first assessed with 1997-2015 model year vehicles involved in side impacts. Sixteen individual cases were downloaded where the front outboard glass window was identified as laminated glass by NASS investigators and where the window was coded as either “out-of placed”, “disintegrated” or “holed”. The case summary and photos were reviewed. The results showed that the laminated glass availability was incorrectly coded in 11 out of the 16 cases. New coding definitions were used to identify vehicles equipped with standard or optional laminated glass in the front side windows using various sources such as NAGS data and sale brochures. The results were compared to the individual cases and found appropriate. The NASS-CDS data was then queried with 1997+ model year vehicles to determine the risk and frequency of front seat occupant ejection status by glass type in rollover crashes using the new definitions. For vehicles equipped with standard laminated glass, the risk was 1.45 ± 0.48% for complete ejected and 4.20 ± 2.37% for partial ejection. Some of the results were based on a small sample (≤ 10 unweighted cases) and should be used as trends. The effectiveness of laminated glass was not assessed. The cases with complete and partial ejection were downloaded. There were four cases with complete ejection. The post-crash photos showed disintegrated glass in two cases and glass damage in one case. The ejection occurred through the side window in two cases. All cases involved a multiple-impact collision, highlighting the severity of the crashes. There were five cases with partial ejection; three involved an arm going out the damaged glass window.


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