"Nobody rode the metro before the metro" — demand always follows infrastructure.

Urban planners have had an image for this for decades: judging a bike path by the number of current cyclists is like judging the usefulness of a bridge by the number of swimmers. Nobody swims to work — not because the demand to cross doesn't exist, but because the infrastructure to do it doesn't. This article assembles the evidence, mode by mode. And it starts with the one mode where everyone, including our critics, already accepts the law.

The proof everyone already accepts: the highway

Ask anyone what happens when you widen a congested highway. The answer comes instantly: "it fills up." It's true, it's measured, and it has a name: induced demand. The reference study, published by economists Gilles Duranton and Matthew Turner in the American Economic Review (2011), even called it the "fundamental law of road congestion": in American cities, every 1% increase in road capacity produces roughly 1% more kilometres driven. Almost one for one. Supply creates its own demand.

The textbook case: Houston's Katy Freeway, widened to as many as 26 lanes — the widest in the world — for about US$2.8 billion. Three years after the work was finished, travel times were worse than before the widening, up to roughly 55% longer in the evening peak. The new lanes didn't absorb traffic: they created it.

Hold on to this point, because the whole article flows from it: if you believe that widening a highway fills it up — and the data confirm it — then you already believe that transport supply creates demand. Everything that follows simply applies your own logic to the other modes.

The law also works in reverse: traffic that evaporates

If supply creates demand, removing it should make some disappear. That's exactly what we observe. In 2003, Seoul demolished an elevated downtown expressway carrying about 168,000 vehicles a day to uncover the Cheonggyecheon river and replace it with a linear park. Experts predicted gridlock. It never came: some of the traffic shifted, and some simply evaporated — trips combined, moved off-peak, transferred to the metro, or dropped altogether.

The phenomenon is documented well beyond Seoul: a British review of some 70 cases of road-capacity removal (Cairns, Atkins and Goodwin, 2002) found that on average, about 11% of traffic simply vanishes. Transport demand is not a fixed quantity you shuffle from one pipe to another: it swells and shrinks with supply.

Metro, tramway, bus: forecasts beaten, again and again

No need to look far. In April 2007, the Montréal metro reached Laval: three stations, $745 million. The City of Montréal expected about 10,000 additional daily trips on the Orange line; two years later, it was observing double that, and the extension was generating some 60,000 riders a day — roughly twice the original estimate. The STM itself acknowledged that its forecasts had been surpassed within the first weeks. Before 2007, how many Laval residents "rode the metro"? Zero. There wasn't one.

Same script on the West Coast. In 2004, elected officials in the Vancouver region insisted that riders for the future Canada Line would never materialize — the proof, they said: the corridor's express bus wasn't overflowing. The line opened in August 2009, ahead of schedule and on budget. The target of 100,000 riders a day, set for 2013, was crossed by the summer of 2010 — three years early. The 120,000 target, set for 2025, fell around 2012 — thirteen years early.

The tramway tells the same story in French: since Nantes (1985) and Strasbourg (1994), some thirty French cities have rebuilt a tramway that "nobody was going to ride," and it became the backbone of local transport everywhere. On the bus side, Bogotá's TransMilenio — dedicated lanes, at its core — has exceeded two million passengers a day. Metro, tram, bus: every time, the ridership didn't exist before. It arrived with the infrastructure.

And cycling? Exactly the same.

The world's textbook case is Seville. In 2006, cycling's share there hovered around 0.5% — a car city, like Québec. The city then built 80 km of protected bike lanes in 18 months, in one stroke, mostly by converting 5,000 on-street parking spaces, for about €32 million. The result: daily bike trips went from about 6,000 to more than 70,000 — eleven times more — and modal share climbed from 0.5% to 6% between 2007 and 2011. A telling detail: Seville's metro line, opened around the same time for €800 million, carries about 44,000 trips a day. The bike network serves 70,000 — for 25 times less money.

Paris re-ran the demonstration at high speed: after the pandemic-era pop-up bike lanes rolled out from 2020, the Institut Paris Région measured in 2024 that cycling accounts for 11.2% of trips within Paris proper, versus 4.3% by car. In Montréal, the REV Saint-Denis — a simple protected surface axis — passed one million rides in its first full year. And in Oulu, Finland, people cycle at −25 °C because the network and its winter maintenance make it possible — the case is detailed in our market study. Four climates, four cultures: one law.

Let's stop counting swimmers

To recap. The highway you widen fills up; the one you demolish partly evaporates. The Laval metro doubled its forecasts; the Canada Line beat its targets thirteen years early; French tramways and the TransMilenio proved their skeptics wrong; Seville multiplied its cyclists by eleven in five years. None of those users were visible before — any more than January's cyclists are visible today on boulevard Laurier.

So the right question is not "where are the cyclists?" They're where the Laval metro's riders were in 2006: in their cars, waiting for an offer worth switching for. The right question — the only one — is the one the whole project file asks: does the proposed network connect the right points, at the right cost, with a real advantage over the alternative? That's what our Study, Price comparison and Critiques & responses pages examine. Counting swimmers will never answer anything.