As land becomes more scarce and traffic gets progressively worse, Southern California's transit planners begin to look seriously at underground highways.
"But Los Angeles is in its 18th year as the nation's most congested metropolis, freeways have little or no space for new lanes and traffic experts are running out of time-shaving options.
So civic leaders are joining engineers to consider burrowing the longest highway tunnels in America.
...Three massive projects are under study in Southern California, each dwarfing any of the nation's 337 underground roadways, including the 2.6-mile tunnel in Boston's infamous "Big Dig," the most costly public works project in U.S. history.
...Southern California, with its mountainous terrain, underground aquifers and seismic vulnerabilities, may prove the ultimate testing ground for subterranean highways."
FULL STORY: With Traffic at a Crawl, Planners Talk of Tunnels
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Planetizen Federal Action Tracker
A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.
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