Dante forgot to describe the circle of Hell reserved for ATAC drivers who fly past their stops without slowing down. If I designed their poetic justice, they'd spend eternity in great hunger in a place with a very warm climate. Once a day, an ice-cream truck driven by a little imp demon would fly by, and as it passed he'd stick out his head and scream, "MAYBE NEXT TIME, YOU FUCKING PRICKS!"
A longstanding proposed solution to Rome's transit problem has been the construction of a third metro line. In this blog post, David Boffa chronicles its history better than I ever could.