A safety apparatus for a sliding door of a vehicle, including a lower rail including a mid stopper bracket; and an arm affixed at an external extremity to the sliding door and connected at an internal extremity to the lower rail, the arm including a mid stopper lever that is rotatable. In an open position, the mid stopper lever contacts the mid stopper bracket and contacts a tongue of the internal extremity of the arm to prevent the sliding door from exceeding a mid open position.