If you live in Toronto and only give serious thought to one thing today, it should be to this interactive transit map created by Metro.

The map shows all existing, planned, and proposed transit lines in the city, and then overlays population densities, commuting patterns, household income, and so on. It’s a super valuable map that I think reveals a lot about how we should be focusing our energies to get Toronto moving.

So what sorts of things does it tell us? I’ll give 2 examples.

If you look at commuting patterns across the Bloor-Danforth subway line, you’ll see that Runnymede station in the west is where people switch over from taking transit to driving. People west of that station tend to drive. Naturally, it also happens to coincide with where population densities start to fall off.

By contrast, if you look at the east side of the city along the Danforth and beyond, the entire stretch more or less relies on transit to get around. Part of this likely has to do with income levels, but it’s also because of the availability of the Gardiner Expressway. There’s no equivalent in the east end. Dylan Reid of Spacing Magazine believes this makes a case for some sort of road pricing along the Gardiner, and I would agree.

As a second example, look at the population densities along the proposed Downtown Relief Line, Finch LRT, and John Tory’s SmartTrack line. Outside of the core, the population densities are relatively low along the proposed SmartTrack line – which is never a good thing for rapid transit.

There’s also no Sherbourne station on the SmartTrack line, which happens to have the highest population density across the entire Relief Line – 22,131 people per square kilometre! That’s more than any other stop along the Yonge-University subway line except for Wellesley station.

I’ve written about this a lot before, but I think we need to do a better job of matching up transit investment with expected customer demand. Too often we let politics get in the way of rationale decision making. Maybe it’s time we did something like set minimum population densities. If you want a subway line in your area, you have to first bring the people.

What else does this map tell you?

One of the biggest pieces of infrastructure currently under construction in Toronto is the Crosstown LRT line, which will run on and under Eglinton Avenue right through the heart of midtown. The total length of the line is 19 km, and 10 km of it will be underground along with 12 of its stations.

Here’s a map:

But as the Chief Planner of Toronto, Jennifer Keesmaat, rightly pointed out in this blog post earlier this year, it’s important to think of this line, not just as a piece of transit infrastructure, but as a broader city building initiative. With this line comes a tremendous opportunity to rethink and rebuild one of Toronto’s most important avenues.

I have no doubt that this will happen over the coming years and decades. I mean, just look at the development activity taking place on St. Clair Avenue West right now, which you could argue is the result of its right-of-way streetcar line. But in this instance, what I’m specifically curious about is what will happen at each of the stations along Eglinton Avenue.

If you take a look at the Stations and Stops page on the Crosstown website, you can see where all of the primary and secondary entrances will be and how each station will generally function. But what is not clear is whether we will be using this opportunity to build additional density on top of them.

CityLab published an article last week on multi-modal cities that caught my attention (because it used a picture of Toronto with about 3 or 4 streetcars stacked up along Queen Street). The premise of the article is that all of this car vs. transit debate is actually missing the bigger picture: our cities are multi-modal and we need to be planning for that.

That’s not to say that the shift away from cars isn’t a good thing. It is. But it’s not as simple as saying that, instead of driving, people should now only take transit. In today’s cities people walk, bike, take streetcars, take buses, take subways, take taxis, take private shuttles, use Uber, and, yes, they still drive.

From my own experience, this is absolutely how I get around Toronto today. I walk to the gym. I ride my bike whenever I’m going somewhere downtown. I take the subway to my office in midtown because it’s far and I would be too sweaty if I biked there. I use Uber and Hailo when I’m going out at night. And I drive when I need to go to the suburbs or leave the city.

But the key takeaway here is that we now have a much tougher challenge on our hands. When we were only optimizing for cars – however detrimental to our cities that was – we only had one mode to plan for. Now we have several. Some of which are public and some of which are private.

However we also have access to technologies that we didn’t have before. We are networked in ways that weren’t possible before and we’re at the dawn of many profound mobility changes, such as driverless cars. (Have you read about