Let's focus on transit where the people are instead. In the GTA, if you're more than a couple minutes from a GO Station, getting somewhere takes an order of magnitude more time than driving. In Montreal, a 20 minute drive can take more than an hour on bus / metro, and force you to cover 2x-3x the distance.

For smaller communities, focus on carpooling instead... If I had a dollar for every car with one person in it on the highway, I'd have enough money to fund... a... uh... national bus service.