Quiz: Highway to History Test your knowledge of the United States Interstate Highway System. By Debra Bell Jan. 7, 2010 Comments SHARE After which president is the Interstate Highway System named? Franklin Roosevelt Harry Truman Dwight Eisenhower John F. Kennedy What is the longest interstate highway in the United States? I-10 I-40 I-80 I-90 Which president signed into law a national maximum speed limit of 55 mph? Lyndon Johnson Richard Nixon Gerald Ford Jimmy Carter Which of these states is home to the oldest still-operational turnpike? Massachusetts New Jersey Ohio Pennsylvania True or false: A predecessor of the Federal Highway Administration was run by the Department of Agriculture. True False To whom do Blue Star Memorial Highways pay tribute? Police officers U.S. presidents Members of the armed forces Firefighters True or false: Individual states set speed limits on interstates. True False Which highway crosses 15 states and D.C., the most of any interstate? I-80 I-90 I-95 I-70 Where is there a gap in I-95? Florida-Georgia Georgia-South Carolina Virginia-Maryland New Jersey-Pennsylvania What was the name of the first road that traversed the United States, from Times Square in New York to Lincoln Park, Calif.? Washington Highway Jefferson Highway Jackson Highway Lincoln Highway Click here for the answers.