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As a hobby, I drive racecars. I have been thinking about something like this near the track to video me going by. (Far away vantage points look boring.)

It seems like for much less than $500 you could build an RPI and just track moving objects via optical flow (assuming you are alone on the track.)

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LeMons racer? That's the first application I thought of but when are you ever alone on track?

You could throw one or two of these in common passing places and combine that feed with in car video. You could get some really neat video.

SCCA Spec Miata. I rent the track privately sometimes.

This would have been much more exciting if it were closer: https://www.youtube.com/watch?v=vfQC0135Vfs

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