Shutters Closed on Red Light Cameras… Attention drawn to “red light cameras” has a broadened focus in Dallas. Some “Big D” traffic signals--designed to be effective for 25 years--have been in service since 1940, with almost all in use since 1980. If tell-tale cameras had been that old, there’d have been black-hooded photographers straddling elevated supports trying to apply matches to magnesium at precisely the right moment to provide lighting for incriminating photos of lawbr ...