Afternoon sunlight reaches into the gloom beneath Interstate 280 at 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 1/400 sec. Exposure, contrast, saturation, and highlights adjustments in Aperture.