Bethesda Magazine » Maryland Transportation Secretary Pete Rahn on Thursday revealed more information about Gov. Larry Hogan’s proposal to add capacity to congested highways in Montgomery County. Rahn said the state is pushing to add four toll lanes to the entire Capital Beltway and Interstate 270 through a public-private partnership. The private partner would figure out how to pay for an estimated $7.6 billion project to add the lanes to the two highways through toll revenue.