Welmoed Sisson’s drive between her northern Montgomery County home and her business clients across the Maryland suburbs often includes a trip on the Intercounty Connector, a toll highway with so little traffic that Sisson can’t recall ever tapping her brakes. Almost 19 miles of pavement with no one in her way. Ever. Not even at rush hour. “It’s not an empty wasteland,” said Sisson, 54, who owns a home inspection business with her husband. “But it’s certainly nowhere near the volume of the free roads in the area. . . . It’s nice, but then again, you’re paying for that...