Thats the same on any camera, to capture a plate at night, you or it have to pass by at a speed no lager than walking speed.
It is simply not possible to do with current technology, or rather affordable technology.
There are plenty of commercials where you see plates clear as day in night footage, but if you look close it are often filmed in a town with more ambient light at night than in our countries in the daytime this time of the year.
And also the cars will be moving slow in respect to each other, and so a plate capture are possible.
I have driven 2 X 45 km today in pretty bleak weather, and i am pretty sure on the highways where we all do 80 i will have very few plate captures, in the rummer it is more a question of how few plates i don't capture.
To get a bright footage as possible in low light conditions a dashcam will drop to 1:30 second exposure time the slowest you can use for 30 FPS footage, that's far too slow for anything that move at speed so it cause a lot of motion blur, ideal you would want a exposure time of 1:500 second at least if you want to photograph something at a higher speed, at least that's what i was told in photo class many decades ago.
If you want to take a picture of a rifle bullet as it zoom past you, you will need a exposure time of 1:200.000 second i recon, the fastest cameras can do about a million FPS and so can have a exposure time of MAX 1:1,000,000 second for each frame.
And for such fast FPS and so also exposure times you need silly amounts of light, so much so even the brightest sun on a summer day will be too little for the really fast slow motion recordings.
If you look at this video from the slow motion guys, the footage of then talking are nice and bright as it is a sunny day. but all the slow motion footage you see are pretty dark, and that's due to them using 200,000 FPS camera and so faster than 1:200,000 second exposure time, and that's pretty fast even with a lot of sunshine.
If the slow motion guys had filmed those clips with a 1 million FPS camera the footage would just be darkness or close to it.
If a dashcam could do such exposure times, or just a fraction of that at night you will see razor sharp pictures, but as you cant add more light at night all you can do is up the sensor sensitivity ( ISO ) which you can do to a degree before you get noise in the picture, but you will need a stupid light sensitive sensor to do that, and while some awesome sensors exist, no one are going to use those as they cant sell dashcams costing 20,000 dollars.
This 1 million FPS fotage of bullets i can assure you the lighting used to capture that would be blinding even if wearing welding mask.
The really fast cameras can now film a light pulse as it pass by, and light move pretty fast.
At this many FPS and so exposure times, the footage are pretty dark hell even the light are faint, and i can assure you they was not using a 80W IKEA desk lamp to light up that footage.