This design is related to a safety device which only uses a single element to prevent the accelerator from being activated in error to cause sudden unintented acceleration, thereby ensuring the driver??s safety in riding. This invention can prevent the driver from activating the accelerator in error to cause sudden unintended acceleration in case the driver stops temporarily and does not turn off the engine. According to this design, only when the groove is associated with the pin can the accelerator be turned on thus increasing the safety in motorcycle riding.