TR News 327: Tunnels: Safety and Technology Advances in the United States and Beyond

Compared with much of the world, the United States has relatively few highway tunnels. Norway, for instance, has more than 900 roadway tunnels, while the entire United States has 503.

In a feature article in TR News magazine, Number 327, May-June 2020, the authors examine the challenges of using tunnels in a road or rail network, including relatively high first costs, the need for continuing maintenance and operational expenditures, and safety matters.