These charts, from the School of Cities at the University of Toronto, are an excellent use case for a ternary chart. A ternary chart is a triangular plot with three different variables that all sum to a constant. In this case, the charts compare driving, walking/biking (active transport), and taking transit, with the constant being 100%. The data is from the 2022-23 Transportation Tomorrow Survey.

What is clear from the first image above is that Old Toronto (also known as the former City of Toronto before amalgamation) is unlike any other municipality in Ontario. Its tight, pre-car urban fabric and transit coverage mean that nearly 65% of people walk, bike, or take transit! This is compared to about 43% for the entirety of the city today; meaning, Old Toronto is the only place where driving isn't the majority mode.

The second chart above shows mode share by age. What is interesting to see, though not surprising, is that younger people are more likely to walk, bike, and take transit. Here, the figures peak between the ages of 15-19 with over 66% of trips falling into these categories, which is just slightly above the Old Toronto figure. Then, as people get older and have greater incomes (which is another one of the charts), they move toward driving.

Of course, this doesn't mean that all older people must drive. There are lots of older people who live in Old Toronto where doing something other than driving makes up the majority of trips. Urban form, density, and access to transit play the most important roles in determining what modes of transport people will choose and what they find most convenient.

Cover photo by Mitch Hodiono on Unsplash

Charts from the School of Cities