Trams, Trains & Bikes: Geometry That Cars And Even Busses Can’t Beat

This graphic it tells a simple but important story. It shows what it takes to move a thousand people. One train. A line of buses. Or a small army of cars.

Most of us conceptualise transport as being about vehicles. But it’s also very much about space.

Cities don’t run out of petrol or electricity first. They run out of room. Footpath space. Lane space. Parking space. Turning lanes. Once you see that, the hierarchy becomes obvious: modes that move the most people with the least space win. Those that hoard space lose.

Cars are brilliant machines for the open road. They’re terrible machines for moving lots of people through limited street space. Even if every car were electric tomorrow, the fundamental problem would remain: one person, one vehicle, an enormous footprint, and a constant need for parking at both ends.

Even when EVs fully replace petrol and diesel powered vehicles - and they will - congestion and land-use will continue to plague us if we keep designing cities as if every trip must be made by private car.

This is where trains and light rail come in. And it isn’t magic. It’s geometry.

A single corridor can carry wildly different numbers of people depending on what you put in it. Fill it with cars and you get a lot of steel moving not many humans. Fill it with frequent, high-capacity transit and you get the opposite: a river of people.

Trams are often mocked as “slow” or “old-fashioned”, usually by people who’ve never lived in a city with them. The real difference isn’t wheels or tracks. It’s whether you give public transport what it needs to perform: priority and reliability. A tram in mixed traffic is just a bus with a superiority complex. But a tram with its own lane, signal priority, and good stops becomes surface rail: predictable, legible, high-trust. People plan their lives around it.

Trains do the same job at a different scale. They don’t just move people; they move the shape of a city. They make it realistic to live with one car instead of two. Or none at all. Because the network does the heavy lifting.

Now, I can hear the pushback already: “Buses are more flexible!” Yes. And buses matter. A good city needs buses. But we need to be honest about why buses often feel disappointing. We make them fight cars for space and then act surprised when they lose. If your bus is stuck in the same traffic as everyone else, it inherits the same unreliability. If you give buses dedicated lanes, signal priority, decent stops, and all-door boarding, then they can become more effective. The lesson isn’t “buses bad”. The lesson is “mixed traffic is the enemy of people-moving”.

And then there are bicycles - the missing chapter in most Australian transport debates.

Bikes (and especially e-bikes) are the cheapest capacity you can buy. They take little space, cost almost nothing to run, and they scale beautifully when the network is safe and accessible. They also solve the first and last few kilometres. A protected bike link to a station can turn “too far to walk” into “easy”. It expands the catchment of every tram and train line without requiring another car park the size of a football field.

This is the systems-thinking leap: stop treating transport as competing tribes and start treating it as a connected system. Bikes feed transit. Transit replaces longer congested car trips. Walking ties it all together. Cars remain available for what they’re best at: freight, trades, regional travel, accessibility needs, and the trips that don’t have a viable alternative.

That brings me to Canberra where I live. A city that is literally building this lesson in real time. We’re putting in light rail - albeit slowly, and amid a level of political heat you’d think was reserved for constitutional reform. Opposition to the tram has become a cultural marker for some, not a practical assessment of what moves people. And there’s a quieter force at work too: FOMO. The fear that someone in another neighbourhood might get a better, faster, more reliable way to move - and you’ll be left stuck in traffic, paying for it.

But data logic doesn’t care about vibes. A growing city can’t keep adding cars and expect the same road space to cope. You don’t “solve” congestion by doubling down on the most space-hungry mode. You solve it by giving people genuine alternatives that are faster, simpler, and reliable. And by designing streets for throughput, not storage.

Canberra’s argument shouldn’t be whether light rail is ideologically pure, politically convenient and an opportunity cost for more hospitals. It should be whether we want a city that spends the next twenty years widening roads, chasing parking, and fighting over footpath space. Or a city that moves more people with less friction. If the goal is a productive, liveable capital, then dragging out the build and endlessly re-litigating the premise is self-harm. We should be speeding it up, not wasting time arguing against it.

If we want an Australia that’s cheaper to live in and easier to move around, we need to stop asking whether a project “helps drivers” and start asking whether it moves people. Fund right-of-way, frequency, and safe bike links as if productivity depends on it. Because it does.

The choice isn’t cars versus light rail and bikes. It’s whether we keep using our scarce street space to store and shuffle private cars, or whether we design it to move human beings.

Once you see that, this simple graphic stops being simple. It becomes a blueprint.

Graphic from Seattle Subway