It has been proven time and again that adding lanes does not reduce traffic, but reducing number of lanes actually can.

https://www.sfchronicle.com/opinion/openforum/article/adding-freeway-lanes-traffic-20390021.php

https://dot.ca.gov/-/media/dot-media/programs/research-innovation-system-information/documents/final-reports/10-12-2015-ncst_brief_inducedtravel_cs6_v3.pdf

https://en.m.wikipedia.org/wiki/Road_diet