The privately owned Ambassador Bridge, with an unfinished ramp (left), links Detroit and Windsor, Ontario, the busiest commercial border crossing in North America. The state's plan for a second bridge is stuck in a state Senate committee. (Associated Press)

The privately owned Ambassador Bridge, with an unfinished ramp (left), links Detroit and Windsor, Ontario, the busiest commercial border crossing in North America. The state's plan for a second bridge is stuck in a state Senate committee. (Associated Press)