Why do Japanese cars beep so much?

I've been driving a Nissan Note for the last week. Why does it have to beep so much? This constant nagging of differing tones of beep gets a bit wearing after a while.

Every now and then you feel like screaming at it: "What is it that you want?". There's a beep to tell you that you've opened the door, a beep to tell you that you have climbed into the car, a beep to tell you that you have stopped the engine and a beep to tell you you have closed the door.

In fact the only time it seems to be quiet is when you have the engine actually running.

Other than that it's a fine car!
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