Here in the DC area, we have the subjectively WORST traffic in the country now (DC, Boston, etc. might argue otherwise). Regardless, they've built almost 0 new capacity in the last decade EXCEPT for toll roads.
Yep, the main road I use in the DC's "tech corridor" in NOVA is a privately owned (by a foreign company, to boot) toll road whose prices have at least doubled in the last 5-7 years. Before Covid, I was getting alerts for $40 top-ups on my EZPass weekly, it seemed.
They used to have incentives for hybrids and EV cars to use the multi-user lanes (much less traffic during rush hour), but I believe they let those expire and now they use price-by-demand algorithms for the costs to use express lanes. They are almost insulting how high the prices will be at peak times - e.g. $20 to use express lanes for 1.5 miles.
As for residential roads - well those are already paid for with gas and local taxes. Interestingly, my state's sales tax is 30% higher than when I was a kid. Prop taxes go up every year due to exploding house prices, but I see absolutely no new services they're providing with all this extra cash. Do you, in your city?