A series of full-scaled car-to-car frontal offset crash tests within passenger car category were conducted to research the current incompatible situations using Hyundai Autonomous Crash Vehicle System. The first test using two midsize cars with 50% overlap and 50km/h each was conducted to compare the injury levels and deformations with the offset regulation case, and check the test results within two same vehicles for test repeatability. The second test using midsize and minisize car with mass ratio of 1.58 :1 was done. The last test with MPV and small car at closing speeds of 120kph was followed. Mass, stiffness and geometry effects are investigated. Simulation results of car-to-car frontal offset and side impacts in case of MPV-to-small and small-to- MPV are included for better understanding. Finally a few design recommendations are also suggested.