And this doesn't just happen at congested intersections, it happens everywhere. Now I complain when my brother pulls up practically on the bumper of the car in front at a light, but a couple feet is usually the norm. A car length and a half is STUPID!
Mood necklaces or rings usually contain a chemical that changes color with heat (example cold to warmer black, purple, blue, green, reddish). They then usually have a pamphlet saying what the colors mean.
Even today, thousands of people query the search engines on what do the colors of a mood ring mean, how does the mood ring work .., etc just like you. As the name suggests, mood ring is a finger jewelry that changes its color according to the emotional state of the wearer.