Congestion is an unsolvable problem. If there's congestion it just means that those people have a higher tolerance (or less alternatives) for sitting in traffi

Congestion is an unsolvable problem. If there's congestion it just means that those people have a higher tolerance (or less alternatives) for sitting in traffic (or standing on a clusterfuck of a subway platform) than whatever your threshold is for deciding what is and isn't "congestion". Consjestion isn't just about cars. You can generalize it to all forms of transit (MTA anyone?). You can't "solve" congestion. At best you can add additional capacity (of the same type or a different type) in order to reduce the amount of time when congestion is at its worst. Instead of "rush hour" being from 3-7 increased capacity (of any type, people will naturally load balance by choosing the least worst option for their situation) could potentially make it only from 4-6 by allowing the same number of trips to happen in less time. If you add capacity (of any type) and congestion is unchanged that is still a win because it means more trips are being taken which is an indication of more stuff getting done, more commerce, higher quality of life).