MARY LOUISE KELLY, HOST: The Senate is preparing to vote as early as this week on a roughly $1 trillion infrastructure bill. Now, the bill is massive not just in price tag, but also in page count. It runs 2,700 pages. Which got us wondering, what is actually in this bill? What would it actually do if it becomes law? For some answers, we are turning to NPR congressional correspondent Kelsey Snell. She has been reading through this enormous piece of legislation. Hey, Kelsey. KELLY: All right. What does this bill do? SNELL: Well, it expands investments in what are mostly considered traditional types of infrastructure. It builds on, you know, the regular highway bill that Congress has been writing and passing for ages. At the core, this bill is a recognition by a group of lawmakers from both parties that Congress could and should be funding more projects; you know, programs and systems that make it easier for people to get around, for people to do work and for the country to trade with the rest of the world. I'd say the biggest investment is about $110 billion for roads and bridges. There's also money for airports, public transit, the power grid, broadband and some limited environmental protection.