Welcome to the forum.
Yeah what you ask are a tall order, at least if we talk about regular in traffic speeds, that is virtually impossible with current technology.
Little signs of hope are there with the new Sony starvis 2 sensors, but really it is not something i would put any bet on.
Mind you. You Americans have made it even harder for yourself with the small plates on cars with additional graphics on, and often only one of those plates on the car.
At least you have to be mindful about that seeing Euro boys capturing plates at night.
There are not really any dashcam that are significantly better than any other camera on the market, CUZ they all use the same hardware, and its not like any of the brands have a strong secret sauce they can put on firmware to bettyer things.
Overall you might be able to find something that can do better, but then it is not a dashcam, and if that hardware was put in a dashcam well instead of a system being a few 100 dillers it will probably end up as a couple of 1000 dollars system.
And even then it would not be small like dashcams, and handling the heat dashcams see in general use might also be a problem