 In 1992 , the Lincoln Highway Association was reformed with a chapter in each state through which the highway passed . The new LHA is a historical preservation group that wants to preserve the remaining sections of the highway . The Iowa chapter of the LHA has , since 2008 , sponsored a tour of the Lincoln Highway . To keep friendly to classic cars , the tour does not travel upon the sections of the road which are gravel . After years of lobbying by the LHA , the Iowa Department of Transportation , in 2006 , designated the Lincoln Highway the first Iowa Heritage Byway . The 2010 Transportation Map of Iowa showed the path designated as the Iowa Heritage Byway for the first time . 
