100 feet is pretty far, given how telephoto the FoV needs to be (~10 feet wide). This means you'll need a long lens (40mm+) and strong IR illuminators. There's a bunch on line that claim up to 100 feet away but that's risky since it's on the edge and most vendors fudge such max specs.
Let's see what we can find.
Avigilon 5MP Integrated IR: About 170 feet with IR:
IPVMU Certified | 11/12/13 04:36am
sure then I can show potential customers and pass it off as our own... just kidding... no need for the video... was just curious if you had to alter the display adjustments once zoomed in to get the plate to pop... it looked clean so I didn't think so...
I imagine when you have cars rolling 30 Mph it's a complete different story, like for a rainy night without moon
Wdr, auto focus, and of course shutter speed can't be let on "Auto" mode
Licence plate cameras are very tricky, you need to catch the right spot for them and the vehicle needs to be going a certain speed also the lighting must be just right. At the place I work, we have tried different cameras locations and even added a speed bump. And the shots are still not 100%.