In the later chapters of The Power Broker, there are stories of transit advocates and driving advocates begging Robert Moses to preserve right of way for transit when building the Van Wyck Expressway and the Long Island Expressway. The expected traffic demand (~9k cars/hr) the day they opened was far beyond the capacity (1500 cars/hour/lane * 3 lanes). A transit line takes about the same space as one traffic lane, with a capacity of 30-40k/hour. Without provision for transit, the road wouldn't even be a good road for drivers, because everyone with no choice but to drive would overcrowd the road and create the congestion the road was supposed to alleviate.
This is setting aside all other considerations - urban design, air pollution, land and property value, tax revenue, health, neighborhood cohesion, etc. Roads without provision for transit and non-motorized travel don't even do the job of a road well.
This is setting aside all other considerations - urban design, air pollution, land and property value, tax revenue, health, neighborhood cohesion, etc. Roads without provision for transit and non-motorized travel don't even do the job of a road well.