"John Gaquin" wrote in message
. ..
There's nothing in their brains that can reconcile another creature moving
at 45-60 mph.

You say that based on what facts?

It may well be outside that particular deer's experience, or the deer may
well just be a poor judge of closing rate (especially in the dark with the
primary object viewed being an artificial light source). But I see no
reason to think that deer are inherently unable to comprehend and correctly
respond to another object moving 45-60 mph. What makes you think that they
are?

Pete