A new lane on a highway looks like relief. Then the traffic on I-405 creeps back, and the shoulder starts to feel like a parking lot.
Donella Meadows had a name for this: a feedback loop. More road space makes driving feel easier, so more people drive.
The road did not fail because it was too small. It failed because the road itself changed the demand.
That is the sting in Thinking in Systems: fixes can feed the problem they meant to solve.