Urges Shareholders to Vote FOR the Board's Nominees on the WHITE Proxy Card Today OAK BROOK, Ill., April 6 /PRNewswire-FirstCall/ -- Federal Signal Corporation (NYSE: FSS) today announced that it is mailing a letter to stockholders in connection with the Company's 2009 Annual Meeting of Stockholders to be held on April 29, 2009. Federal Signal's Board of Directors unanimously recommends that stockholders elect the Company's highly-qualified nominees - James E.