llinois DOT changes work zone signs as speed limit climbs Apr 15, 2014 3:12:06 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by logpedia on Apr 15, 2014 3:12:06 GMT -5 Illinois transportation officials are adding extra safety precautions to work zones around the state after the speed limit was increased to 70 mph on some highways.DETAILS