I've been testing plate number reading with 4K, 2K 30fps and 1080p (30fps and 60fps) and all of them are poor especially the vehicles on the other lanes (those vehicles at your sides). They are blurry. Incoming cars are bad too. Overtaking motorcycles are mostly unreadable. Here in my country, most of the motorcycles always hit & run and they do not have valid insurance.
I noted the lower the resolution, the brighter the recording will be. 4k 30fps and 2k 60fps has the same brightness though since it has to capture the same amount of bytes. So lowering the EV may reduce the blur. Haven't tried that.
In still photography, you need to hold the shutter to let more light in to make the image brighter but any shakiness will cause the image to blur. I'm seeing similar thing here. No mater what resolutions or fps you use, the video captured are blurry if the other vehicles are not at the same speed as you. Can I say that the A129 Pro shutter speed is low?
Anyway since all of resolutions are almost equally blurry, the 4K captured the best image due to higher resolution.
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