Lines That Move Better

The single serpentine line, generalized in banks and airports, is not faster than one line per counter. It is especially perceived as more fair: it guarantees strict order of arrival.

The single serpentine line, generalized in banks and airports since the 1970s, is not faster than one line per counter — the average speed remains almost identical. It is especially perceived as more fair: it guarantees strict order of arrival, first in, first out, visible to all. The gain is not temporal but psychological: the reduction of variance eliminates the "bad line" where one stagnates while the neighbor's advances.

The engine is felt injustice. Being overtaken is experienced as more painful than waiting itself; by imposing a single path, the serpentine suppresses the anxious choice of line and the sensation of inequity. Studies by David Maister and other researchers in queue psychology confirm that the perception of equity counts as much as the actual duration.

The device has a cost: a single line impresses by its apparent length and can discourage at entry. Some businesses renounce it in favor of parallel lines bordered by products, betting on impulse purchase rather than on waiting comfort. Understanding the serpentine is seeing how the architecture of service shapes satisfaction as much as speed — and how "fair" can be worth more than "fast."