Adverse Effects of Seat Belts and Causes of Belt Failures in Severe Car Accidents in Switzerland During 1976 770916
Results of a one year field study initiated by the Swiss Federal Police Department in connection with a mandatory seat belt law effective January 1, 1976 are presented. 304 accidents with 153 killed and 257 severely injured (OAIS ≧ 2) belted occupants were analysed during this program. As belt effectiveness has previously been demonstrated in field investigations the following specific problems are discussed:
Frequency and statistical significance of cases in which, with a high degree of probability, the belt had an adverse effect
Relevant injury patterns
Frequency and causes of belt failures including releasing difficulties after a crash
Possible improvements.
Furthermore, the applicability of Calspan's SMAC method is demonstrated and discussed. In case of car to car collisions the mass ratio is shown to be of importance. A correlation analysis between the velocity change during the collision phase (Δv) and the injury severity is performed. Special attention is given to frontal crashes with no or minimal passenger compartment intrusion. Severe injuries in such cases can usually be attributed to one or more of the following reasons: submarining, excessive slack, inadequate mechanical compatibility between belt system compliance and mechanical properties of the chest (e.g., old age), overloading due to backseat passenger.
Citation: Niederer, P., Walz, F., and Zollinger, U., "Adverse Effects of Seat Belts and Causes of Belt Failures in Severe Car Accidents in Switzerland During 1976," SAE Technical Paper 770916, 1977, https://doi.org/10.4271/770916. Download Citation
Author(s):
P. Niederer, F. Walz, U. Zollinger
Affiliated:
Institute for Forensic Medicine, University of Zurich
Pages: 39
Event:
21st Stapp Car Crash Conference
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Twenty-First Stapp Car Crash Conference-P-073
Related Topics:
Safety belts
Frontal collisions
Injuries
Passenger compartments
Statistical analysis
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