Yeah at night even the best dashcams struggle when it come to plate readability, and i fear we will not see improvements there within the next couple of years.
Need more light sensetive CMOS chips so the camera can maintain a faster exposure time when it is dark.
Even with thodays chips you will notice some motion blur at the edges of footge even on cloudy days.
But with blue skies and plenty of sunshine its possible to get razor sharp images, i have notised this with the innovv C3 filming out the side of my car, when the sun is there i can blast past somthing at 80 km/h and get good footage, but as soon as the sun is behind a cloud the motion blur rear its ugly head.
Then again its not allways needed to capture the licenceplate of the other guy in case of a accident, but in a case like this it woud be nice to have somthing to forward to the right persons.