You are right, at night ( also in the evening or cloudy day ) numberplates are "blown out" in the scenes where cars speed are different. In the scenes where your car speed is close to the front- or side lane moving car speed ( almost synchronised ), or you stopped in traffic, then as you can see from video samples, nubmerplates reading is quite clear. If in front of you- or side lane car speed is different than your car speed, then numberplates are getting "blown out". This rule applies to ALL dashcams.
Also big role plays numberplates light reflection and what type of headlights bulbs are used. You may read here:
Reading License Plates at Night. HID / Xenon, standard bulbs
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