Nobody in this line of cars is moving, and that is a lie the road is telling you. Every one of those idling engines is a controlled fire, burning ancient sunlight, hydrocarbons laid down by algae that drank photons in a Carboniferous swamp three hundred million years ago. You are not stuck in traffic. You are sitting in a two-mile queue of tiny suns, each converting fossilized summers into heat and forward-nudging motion that goes almost nowhere.
Watch how the jam behaves. It has a shape. A driver two hundred cars ahead taps a brake, and the pause travels backward through the pack faster than any car travels forward, a wave of stopping that moves the wrong way down the line. Physicists model this exactly like the compression waves in a gas, or like a shockwave, because that is what it is: a phantom traffic jam, a disturbance propagating through a medium made of metal and impatience.
The wave can persist for hours after the original brake-tapper has driven home and forgotten it.
And the honking. Each blast is a pressure fluctuation rippling out at roughly 343 meters per second, molecules of air shoving neighboring molecules, a message that decays into warmth before it reaches anyone who could act on it.
Someone in that car ahead is furious, gripping the wheel, certain the universe has singled them out. Meanwhile the true situation: several tons of iron, forged in the cores of dying stars and scattered by supernovae, are being held one meter apart by nothing but the electromagnetic repulsion of electron shells, warmed by exploded plankton, obeying the same wave equations as sound.
The whole seething, stalled, cursing mass of it, waiting, for a signal to change color.