With the starlight and this level of IR I cant imagine this is for actual license plates, im thinking more like reading some non-reflective identification like window decals or company/city id labels.
with the lil IR in the turret I had to have shutter speeds like 1/5000 with gain very low to even get it in range of readability.. seemed far too sensitive for the variations in plates I see, would need some very fast adapting auto exposure designed for plates I think