From the time Oliver Lippincott drove the first automobile into Yosemite Valley to the first few adventurous travelers who explored the park by horseless carriage, until now, motor vehicles have been a part of Yosemite National Park history.
http://www.examiner.com/x-4661-National-Parks-Travel-Examiner~y2009m7d25-Yosemite-National-Parktour-the-valley-by-tram