AMERICA'S TOLL ROADS, BETTER KNOWN for political patronage than for strong business and financial management, suddenly are hot assets. Already, foreign companies have paid rich prices for highways in Chicago and Indiana. And similar deals could be made over the next few years for the Ohio Turnpike, the Illinois Toll Highway, several toll roads around Houston, the Atlantic City Expressway and perhaps even the New Jersey Turnpike, America's best-known toll road, featured in the opening credits of The Sopranos. Private money potentially also could fund a multibillion-dollar toll bridge that would replace the aging and congested Tappan Zee span across...