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.
In this simulated image of Saturn's rings, color is used to present information about ring particle sizes in different regions based on the measured effects of three radio signals. Three simultaneous radio signals of 0.94, 3.6 and 13 centimeter wavelength (Ka-, X- and S-bands) were sent from the Cassini spacecraft through the rings to Earth.