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Test procedures to assess vehicle compatibility were investigated based on a series of crash tests. Structural interaction and compartment strength are significant for compatibility, and full-width tests and overload tests have been proposed to assess these key factors. Full-width rigid and deformable barrier test results were compared with respect to force distributions, structural deformation and dummy responses. In full-width deformable tests, forces from structures can be clearly shown in barrier force distributions. The average height of force (AHOF) determined in full rigid and deformable barrier tests were similar. From car-to-car tests, it was demonstrated that stiffening the compartment of small cars is an effective and direct way to improve compatibility. To evaluate the compartment strength, five overload tests were carried out. The rebound force is proposed as a compartment strength criterion.