I think it’s established fact that you can’t reduce congestions by adding more lanes and roads.

I mean, if it worked we would see the successes in all those giant freeway cities but instead the problem just grows.

If we just turn everything into road then nobody will have anywhere to go. It's the perfect solution

I think more lanes can be a solution but it has a more particular place than does now and there seems to be diminishing returns after about three lanes.

Another reason it doesn't reduce congestion is that lane changes are frequently the cause of accidents or hard braking, which creates traffic jams. And Americans' complete lack of lane discipline just makes it all worse.

Actually, inadequate lanes do contribute to congestion. The traffic will always be pretty much standard... the time of transit however is slowed so it may seem like there are less cars... but no, it is less road. Also, the curvature of the roads -- especially on on ramps can affect visibility of oncoming traffic and not providing for a properly lengthed merge lane is also a big problem. Some things that can help slow down (prevent speeding at merging areas/onramps) so it is easier to merge is having islands between the right and left lanes with greenery, more lights/slowdowns and providing a fast lane for carshares and buses. Building in service roads and bypasses also decreases the congestion.

pretty sure that mostly applies to mega cities that shouldn't have multi-lane roads to begin with