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Most people always have little concern about cars come from behind when they are getting off the car. A number of people even do not aware of it, thats how accidents occur
However , it is difficult to inform the cars from behind clearly that you are getting off , especially at night .
By using pre open, it can prevent us from neglecting the cars from behind. Also, it can open up the car door a little bit to inform the cars from behind. Even if there is no car comes from behind, the function is not needed; the car door can still be opened simply with the bigger angle.