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This paper demonstrates a novel car-following model based on driver or passengers' comfort. As we know, rapid deceleration during emergency brake will make passengers feel uncomfortable, according to the relationship between brake acceleration and people's comfortable feeling, the comfortable model of car following is being setup. The model calculates the following car's acceleration by measuring the distance between the following car and the preceding car, and the velocity of the following car, to keep drive and passengers feel comfortable by controlling the car's acceleration. The friction coefficient of the car and road surface are also considered, the experiments show that the model fits the real cases very well.