Based on a couple of week-days of traffic, I estimate that our average daily traffic is between 100 and 150 per day. That includes traffic traveling in both directions.
There is some guess-work involved because the camera is much more capable at seeing vehicles going away than it is coming toward it. I suspect that the trigger is in the IR portion of the spectrum and tail-pipes are a very crisp signal.
 
Maybe you need two cameras, one facing up the road and one facing down the road?
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