The scene repeats itself daily on city streets: a driver gets stuck bumper to bumper, blocking an intersection and preventing another car from turning left.
But authorities say that was enough to cause Edwin Ramos to unload an AK-47 assault weapon on a man and his two sons, killing them.
The deaths immediately drew public outrage, which intensified when authorities revealed that Ramos, 21, is an illegal immigrant who managed to avoid deportation despite previous brushes with the law.