With all that Supreme Court health-care business out of the way, Congress can now turn to other pressing matters … like making sure that billions of dollars in highway projects across the country don’t screech to a halt when funding expires Saturday. That’s right, another infrastructure armageddon is looming.

Vehicles drive on I-81. (Michael S. Williamson/The Washington Post)

In theory, there’s a deal at hand to avert chaos. Key members of the House and Senate just tentatively agreed on a new $120 billion transportation bill (pdf) that will fund the nation’s roads, bridges and mass transit for the next 27 months. Both chambers are expected to take a final vote on the measure Friday. But, as always, there might be a few last hiccups. Here are five key things to know about the bill: