Currently the nation's interstates are toll-free, except to pay for new lane construction. With the Highway Trust Fund set to run out of money, many are turning to tolls as a way to fund highway and transit projects. Others think raising the gas tax is a better option. This hour we'll talk about several proposals to keep our roads running smoothly.

Guests:

Martin Di Caro, transportation reporter for WAMU

David Goldberg, Communications Director, Transportation for America

Randal O'Toole, Cato Institute Senior Fellow on transportation issues