[AnthonyMouse]

> You also need to park your car somewhere at the destination.

This is generally not the problem because most of the destinations aren't in the high-scarcity congestion area, people just have to go through it to get to their destination from their point of origin.

> Of course you don't want to build trams and all in low density (and low population) areas and my comment didn't apply for such case. You must have density as well as mixed use zones.

Which is the thing the US doesn't. Large percentages of land in the areas around many major cities -- some of them among the most congested -- is zoned exclusively for single family homes. There isn't enough density for mass transit to work and it's residential-only, so working within walking distance of those homes is essentially prohibited by law.