Back in July, I tried to use Active Track on my Mini 4 Pro to track myself driving very slowly around our village car park in my 3 wheeler BSA. As you can see in the video below, it just wasn’t interested in tracking me and the car.
But I seem to remember reading somewhere that the Mini 4 Pro wasn’t meant to track anything other than people, but that the Mini 5 Pro will track vehicles. Can anyone confirm that please?
Hi Paul 
Yes the Dji Mini 4 pro will track cars here is how you do it…
How to use Active Track with cars
Identify the subject: Use the on-screen controls to draw a box around the vehicle you want to track.
Activate ActiveTrack: Select the “ActiveTrack” option after the subject is boxed.
Choose a tracking mode: Select between “Trace” (following behind) or “Parallel” (flying alongside the subject).
Adjust settings: The drone offers options for camera motion when tracking vehicles.
Start tracking: Hit “Start” or “Go” to begin the active tracking sequence.
I hope this helps you out paul 
