Motion Detection: Detect motions then start recording during driving.
"Motion Detection" in the main menu of the camera will turn on Motion Detection while the camera is turned on. Typically you would not enable "Motion Detection" while driving - as there would be constant motion and thus constant recording.
Parking motion Detection: It could only affect the sensitivity of auto motion detection during parking.
"Parking Motion Detection" is only used when you could supply power to the camera while regular power to the camera is off. It is used to adjust the sensitivity of parking motion detection when you have turned on "Parking Mode" - and have selected "Advanced Parking Mode" .
Auto Event Detections: Detect motions and collisions then save before 15s and after the 30s of the motion during parking.