This dual-camera system sets the bar high for the 4K competition.

Viofo’s A129 Pro Duo must be performing some level of optical and video processing voodoo, because this front/rear dash cam combo ($250 on Amazon) captures are nearly perfect. As the 4K UHD upgrade from the Viofo A129 Duo (currently $169.90 on Amazon), the front video shows enough detail to make me think that the extra storage space 4K UHD requires (four times 1080p) might actually be worth it. The rear video is some of the best 1080p I’ve seen.
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https://www.pcworld.com/article/3489137/viofo-a129-pro-duo-review.html