This is an article put out by the Los Angeles Metropolitan Transportation Authority (LA METRO) to update the public on the progress of the I-405 Sepulveda Pass Improvement project. Provides a recap of all the construction feats that have been accomplished to date, a brief overview of the challenges the project has faced, and what they plan to accomplish within the next year.
Below is a depiction of just how complex the utility system is under the existing road, which has been one of the most challenging aspects of the project:
