A new cycle lane often carries less traffic than expected in its first year, which is regularly read as evidence that the investment failed. The delay reflects how travel decisions are actually made.
Journeys need a whole route, not a segment
A cyclist evaluates the full distance from origin to destination, and the worst section governs the decision regardless of how good the rest is.
An excellent lane ending at a difficult junction leaves the underlying obstacle intact, so the improvement changes little for anyone whose route crosses it.
Networks therefore produce benefits non-linearly, with modest effects until connections close and then a disproportionate response once they do.
Perceived safety lags physical safety
People decide whether to cycle on how a route feels rather than on collision statistics they have never seen.
Separation from motor traffic is the strongest determinant of that feeling, which is why painted lanes shift behaviour far less than physically protected ones.
Perception also updates slowly, since someone who stopped cycling years ago has no reason to reassess a route they no longer consider.
Travel habits reset at life events
Most people are not choosing a mode each morning but repeating a decision made once, and that decision is remarkably stable.
Moving house, changing job or a shift in household composition reopens the question, and those moments arrive at their own pace.
Infrastructure built today therefore captures its users gradually, as successive households pass through the periods when their routines are in flux.
Storage and end-of-trip conditions are decisive
A route is only usable if a bicycle can be kept securely at both ends, and secure storage at home is frequently the binding constraint.
Apartment buildings without ground-floor space, and workplaces without racks, exclude people who would otherwise cycle a perfectly good route.
These provisions attract far less attention than lanes but determine whether the lane is usable for a given household at all.
Evaluation windows are usually too short
Counts taken shortly after opening measure people who already cycled and rerouted, not people who took up cycling because conditions changed.
The second group appears over years, and assessments concluded early systematically understate what a connected network eventually carries.
Cities that have built continuously for decades show the effect clearly, and their experience is the main evidence that the lag is a delay rather than a failure.