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It's also essential to secure the car against accidental movement while stationary. Example: you're stopped at a pedestrian crossing and somebody shunts you up the rear, you don't want to be ploughing into the pedestrians because your foot slipped off the brake.
It's like patenting TV as 'a box which show moving pictures captured by another box with a lens' rather than 'apparatus for modulating an electron beam in rectangular matrix...'.
Thank goodness for that!