Almost everyone has experienced it. Cars are barely moving. The traffic light ahead is still red. Nobody has anywhere to go. Yet suddenly, someone starts honking. Then another person joins in. Soon, an entire lane seems to be participating. To outsiders, the behavior may seem irrational. After all, a horn cannot magically remove a traffic jam. But psychology suggests there is much more happening beneath the surface. People who honk excessively in heavy traffic are not always impatient or rude.