A seemingly innocuous point in the Biden administration’s infrastructure bill related to the Highway Trust Fund has rate market investors once again sharpening their focus on exactly when the U.S. government might breach its borrowing limit.

The Federal Reserve is keeping a close eye on economic data as it “assesses the appropriate path” for monetary policy, but the central bank and traders in financial markets may find their vision blurred if Washington gridlock spurs yet another government shutdown later this month.