Photo of the Day: April 6, 2009

Bright red paint and big stenciled letters: now here's a sign that you feel compelled to obey. Flickr user owash snapped this shot of a slightly worn (but still plenty effective) warning sign while underground in the U.S. Capitol Subway System. The system, which connects various Congressional office buildings to the Capitol, celebrated its 100th birthday last month. EXIF.