Interstate 70 in Colorado is very problematic. It is constantly backed up. Colorado needs to learn from this and get serious about rail for shipping and for human travel.
Note that I have no confidence Colorado will tackle the issues driving costs up. Several of the known factors are places where politically powerful people (from all sides so don't bring in class warfare) are increasing costs and they let you cut them off. There are a lot of unkonwen issues left after factoring the above, and it is likely they also have politically powerful people increasing costs.
Federal non-defense spending in the US is as high as ever (ignoring the brief COVID spike) https://www.cato.org/blog/century-federal-spending-1925-2025
The i70 line will never happen.