Seismically reinforced structure holding up Interstate 280 above the north portal of Caltrain tunnel #1, San Francisco.

Shot with the Nikon D70s and the 18-70mm f/3.5-4.5 zoom at 70mm, ISO 400, f/4.5, shutter 1/160 sec. Cropping, white balance, exposure, levels, and highlights adjustments in Aperture, crud removal in Photoshop CS4.