wrong, congress cannot authorize and appropriate the money for the bridge unless it is in the current funding budget.
your example would be illegal.
The opposite is true.
I get that you're afraid to post facts but you could still look them up for your own education. And, the You Tube I posted is very simple and to the point.
Lets say that congress wants to have a new bridge built and it will cost 500 million. They cannot sign the construction contract until the money is appropriated and authorized i.e. set aside to pay the bill when it comes in.
look up "authorization" and "appropriation" bills, those words have precise meanings in govt fiscal jargon.
so your premise that new borrowing is needed when the bridge bill comes in is wrong, the funding must be set aside before the govt signs the contract.
some very expensive and lengthy projects, like aircraft carriers, use multi year funding whereby part of the project is funded each fiscal year, but the catch is that the project stops if continued funding is not authorized and appropriated each year.
raising the debt limt is necessary to fund new govt programs that did not have money appropriated for them in prior years.
the debt goes up when the debt ceiling is increased--------you do know what the word "ceiling' means in terms of spending don't you?