David Nail - Red Light Lyrics Meaning

The song is about Nail and his girlfirend going for a Sunday drive. However, instead of the pleasant outing he imagined, his girlfriend unexpectedly breaks up with him a a red light, simply leaving the car and walking away. I also think of this song when I fail something or something bad happens, while others just keep going on with their life, just like the "old man dressed in his Sunday best just waiting on green".