In regards to prevalence of PT, population densities do matter. Policies to curb sprawl and encourage brownfield development increase population density. In 2023, Canadian Urban Area population densities were closer to that of European countries than the United States and Australia. I doubt this was the case a few generations ago. Due to rapid population growth and intensification efforts, Canadian Urban Areas could become denser than German, Italian, and French in the next 15 years. Data can be helpful so I will post some. Demographia publish tables for Urban Areas of 500,000+.
2023 Population Density of Urban Areas
(Number of 500,000+ Urban Areas in brackets)
France (8): 2,972 people/km2
Italy (9): 2,946 people/km2
Germany (14): 2,827 people/km2
Canada (9): 2,490 people/km2
Australia (5): 1,550 people/km2
United States (70): 1,220 people/km2
http://www.demographia.com/db-worldua.pdf