Identify the Flaw in Public Transportation Argument

A recent forum on city planning discussed the benefits of public transportation. One participant argued, “Cities that invest in public transportation tend to have less traffic congestion. Therefore, if our city increases its investment in public transportation, we will significantly reduce traffic congestion.”

However, critics pointed out that this reasoning overlooks other factors that could affect traffic congestion, such as the population density of the city and the availability of alternative commuting options.