Abstract
The movement of cars striking obstacles of various kinds and other vehicles has been investigated and in all cases simple mathematical analyses have been found adequate to predict these motions. The obstacles considered were lamp columns, trees, bridge abutments and walls, struck at various angles and speeds, and the two-vehicle collisions covered a range of weights, velocities and collision angles representing head-on, rear-end and intersection accidents. The movements of the car occupants and their velocities, relative to the car during the most violent phases of impact, are also calculated. The theoretical conclusions are illustrated by examples taken from actual accidents.

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