Describe at least two ways that your understanding of the doppler effect could be applied to everyday life

-- When I am driving very fast and I see a green traffic light ahead,
I need to be aware that the light could have been shifted toward shorter
apparent wavelengths because of my high speed approaching the source.
The light may actually be a red one, so I know that it would be wise to slow
down.

-- When I hear my wife yelling at me in a pitch that sounds higher than
her normal agitated voice, it's logical to assume that she is approaching
me at a high rate of speed, and I had better hide for my own good.