Except that not how it actually works. The north shore connector is a pretty good example of how it does. Federal money is frequently given to regional planners for a stated purpose and the local planners make the final decisions on how to achieve the purpose.

Most everyone who supported doing so assumed it would be used for one of the proposals on the table to extend it to Oakland or the North Hills. It wasn't until after the money was approved that locals decided the tunnel to the stadiums was the best use of the money. Technically it meet the objective, it did expand the existing system but virtually nobody who sought or supported the funding imagined it being used is such a manner.

Same for the funding of the transportation to the airport, funding was provided as part of the airport project for the purpose of increasing access to the new airport site, not a specific project, and most everyone thought that would be one of several LTR proposals that had been made. Once the airport funding was approved locals opted to build a bus way instead which technically met the criteria of the funding. When all was said and done, one crappy bus route was all that came to be and the funding for that project disappeared down the rabbit hole.

That's how it always works for new projects around here, one big shell game.