Even in Rally drivers testing has shown the average response to be 1.5s or so, and that is with you basically expecting something to pop up in front of you the whole time.
The 0.5 to 0.7 seconds is really a totally best case scenario, the travel time for the nerve response alone from brain to foot in a 180cm male eats up a reasonable portion of that.
0.5s response times can be readily achieved, but not maintained, even during a controlled event like a race.
On the open road on a long trip with all of the other things on your mind, an average of 1.5 - 3.0s is a pretty reasonable expectation.
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