A 30-minute silent film chronicled the ten-millionth Model T's journey across this thing.  
The Quaker Oats company donated enough oats for a "shower of oats" scene in a film promoting this thing at the Panama-Pacific International Exposition.  Woodrow Wilson was given membership ticket #1 for an association named for this thing.  Wilson signed into law a bill lobbied for by AASHO that would provide government funding for future projects like this one.  Woody Guthrie described how he'd been "walking" this thing in the song "Hard Travelin'".  Rubber and cement companies donated to provide paved "seeding miles" along this route.  This route ended at a park also honoring its (*) namesake in San Francisco.  A 30-minute silent film chronicled the ten-millionth Model T's journey across this thing.  The crappiness of this route on a 1919 Army expedition inspired Dwight Eisenhower to back the Interstate Highway System.  For 10 points, name this first transcontinental road in the United States, named for the nation's sixteenth President.
The Quaker Oats company donated enough oats for a "shower of oats" scene in a film promoting this thing at the Panama-Pacific International Exposition.  
Lincoln Highway [prompt on Route 30] 