These two photos are video grabs from today, of an innocent motorist, just to show what can be done:
- One from helmet camera. (Replay XD Prime X, FOV set to 116 degrees).
- The other from a rear-facing camera mounted 2" inboard from the end cap of drop bars, (Replay XD 1080 Mini, FOV fixed at 110 degrees).

I'm climbing a mild grade at ~12mph in a marked bike lane. The car is doing ~45-50mph, and is giving me plenty of room, at least 6'. Note that the sun is at my back, so the rear camera is pointing toward the sun, and the front of the car is in the shade. Both cameras are shooting 1080p @ 30fps.

A big issue with reading license plates is that low-cost POV cameras frequently have crazy wide FOV. That is good in that it makes it more likely your subject is in the frame. But it sucks for reading plates because it makes all objects look smaller, and further away. For example my old Contour Roam has 170 degree FOV!