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Varia Radar & Edge 1000 -- sometimes orange, sometimes red warning when car -- cause?

This question is about when the Varia radar detects a car and displays the warning bars on either side of the display screen and the car/dot progresses to the top.....

Most times that color bar is orange, but occasionally it is very red. I haven't been able to determine what causes the difference -- i.e. what the different colors are supposed to be telling me.

Anyone know?