First, for evaluating vehicles' emergency handling performance in real world, we set several course patterns of closed-loop test (task performance test) similar to occurring patterns of real accidents, and measure the vehicles’maximum entering velocity of each course.

Second, we normalize the velocity by each vehicle’s basic dimensions (mass, height of center of gravity, tread etc.), which enable us to compare the tire and suspension performance.

Last, we produce an estimation method of the results of the closed-loop tests, using a vehicle's design parameters, which include basic dimensions, suspension and tire. We consider that this estimation method can reduce the time for developing cars.