The International Information Center for Structural Engineers

It was April 4, 2017, when the work of tunneling machine Bertha was complete, breaking through into her disassembly pit and marking the end of the 1.75-mile long State Route 99 (SR 99) tunnel beneath Seattle. Now, the Washington State Department of Transportation released a drone video that shows the ongoing construction work from end-to-end inside the tunnel.

It should be able to support the transition period and become the basis for the future, fully automated, transport systems

The tunnel will become a double-decker highway, scheduled to open in 2019

The Colorado Department of Transportation finalized the state’s first public-private partnership contract last week. The contract allows private consortium Plenary Roads Denver to complete the second phase of the U.S. 36 Managed Lanes project. In addition to expanding and approving the existing highway between Denver and Boulder, Plenary Roads Denver will also be required to maintain the road for 50 years.

Additional Info

  • Date occured Friday, 28 February 2014

The Cleveland National Forest Foundation, a small group of environmental advocates, filed a lawsuit against Caltrans on Wednesday over the plans to expand I-5 in the San Diego area.  The lawsuit claims the freeway expansion would lead to “an enormous surge in greenhouse gas emissions.”  Caltrans Final Environmental Impact Report, which was signed on October 23, 2013, states that the express lanes expansion project is the best way to serve the 300,000 daily trips along the freeway by 2030 as it has the least impact on natural resources, requires fewest property relocations, and has the lowest construction costs. 

Additional Info

  • Date occured Wednesday, 11 December 2013