 In the 1920s, the Park Service actively promoted automobile tourism.Roads and roadside attractions bloomed on the sites of Yellowstone, the Grand Canyon, and Yosemite.Roads, they believed, would also increase accessibility for "those who are not as strong and agile as you and I, for they too are entitled to their inspiration and enjoyment," as Albright stated in a 1931 letter about roads in the Smokies.