Is there any evidence that the extra lane reduces congestion in the long run? The studies I have seen found the opposite: a brief period of benefit before incre

Is there any evidence that the extra lane reduces congestion in the long run? The studies I have seen found the opposite: a brief period of benefit before increased volume (jevons paradox) leads to as much congestion as before. Downstream roads can then become even more congested. I wonder how many lives could be saved by an efficient and affordable rail network?