Another flawed assumption we see too often, what makes you think EVERY passenger on that streetcar owns a car?
No, but the majority do. Assume 60% on the streetcar do. That means 60/100 people. Assume 1.2 passengers per vehicle during rush hour. So that means that every streetcar takes 50 cars off the road during rush hour. What do you think will have a larger impact on traffic flow? 1 streetcar, or 50 cars?