Three-channel systems are something of a niche in the dash cam world. Most drivers can benefit from dash cams that face forwards and backwards, but those that also look into the interior of the car are intended for taxi and ride-share drivers.
With such a system, these drivers benefit from the usual recordings to the front and rear, but also a dedicated camera pointing inwards. The mere presence of an interior-facing camera can help prevent passengers from misbehaving, but also gives a third view of an accident. If the driver was unfortunate enough to be distracted by their passenger, or even assaulted, the best 3 channel dash cams can be there to help capture evidence.
