Guests walk through one of two tunnels that will replace a notorious stretch of California's Highway...
Guests walk through one of two tunnels that will replace a notorious stretch of California's Highway 1 at Devil’s Slide near Pacifica, California March 25, 2013. The tunnels mark the completion of the $439 million transportation project, which bypass a steep, winding portion of the coastal highway south of San Francisco that has long been susceptible to rockslide-related closures. REUTERS/Robert Galbraith (UNITED STATES - Tags: ENVIRONMENT TRANSPORT)