Collecting tolls in Hampton Roads is a $180-million-a-year business — nearly twice the size of the region’s fishing and farming sectors combined — and is set to grow. Much of that money goes to finance a private venture’s $1.5 billion expansion of the road and tunnel network connecting Norfolk and Portsmouth. A somewhat smaller amount goes to the public body that’s spending nearly $800 million to dig a parallel tunnel for the 55-year-old, 23-mile Chesapeake Bay Bridge Tunnel. A much smaller part goes to keep the Coleman Bridge over the York River in shape, and to pay off the cost...