How to predict vehicle reversed direction motion from dashcam video?

There is an onboard dashboard camera in the car, I am trying to analyze the driving recording video.

The data is first-person point of view moving video, I am able to detect the motion direction in forward, right, and left with the technique optical flow in opencv so far. However, I cannot get the correct detection while the car is driving backward.

Are there any suggestions for detecting the reverse direction with car dashcam recording?

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