Yosemite is visited anually by millions of people with most of them heading for the Yosemite Valley. During the summer the roads can become extremely congested. That is why the visitors are encouraged to park their own car in one of the parking lots available and take the free shuttle to points of interest in Yosemite Valley. The shuttle runs every 10-20 minutes so you won't have to wait for long.
Rather than driving yourself all around use the (mainly)free shuttle bus to get to the main sites in the park. It is free to get around the valley, to Wawona and the Mariposa Grove and also to Tuolumne Meadows. To get to Glacier Point a fee is charged.
The free Tuolumne Meadows shuttle bus provides convenient access throughout the Tuolumne Meadows area between the Tuolumne Lodge and Olmsted Point (including Tenaya Lake) during the summer. In addition to its regular route, the bus picks up and drops off passengers at Tioga Pass at 9:00 am, 12:00 pm, 3:00 pm, and 5:00 pm.
The Tuolumne Meadows Hikers' Bus provides convenient access along the Tioga Road for hikers wanting to begin a hike along the Tioga Road. The bus leaves Yosemite Valley each morning (July through Labor Day) with stops at Crane Flat, White Wolf, and Tuolumne Meadows Lodge. Per person charge: Adults $11.00, Children $5.50, depending on where the passenger is dropped off. To guarantee seating, hikers must purchase tickets one day in advance.
The Glacier Point Hikers' Bus provides convenient access to Glacier Point for hikers wanting to begin a hike at Glacier Point and end elsewhere or for visitors not wanting to drive to Glacier Point. Visitors may ride the bus to Glacier Point and hike down, or hike up and return by bus. To guarantee seating, hikers must purchase tickets one day in advance.
There are free shuttle buses in the park, which also drive to trail heads not allowed to access with your own car.
The link below will bring you directly to the information about the shuttle buses on the official homepage of the Yosemite National Park. See the downloadable map there...
Free shuttle bus service is provided throughout the eastern portion of Yosemite Valley year-round. In summer, free shuttle buses run from Wawona to Mariposa Grove and from Tioga Pass to Tenaya Lake and the May Lake parking area. Hikers' buses run daily to Glacier Point late spring through autumn and to Tuolumne Meadows late June through Labor Day. Call 209.372.1240 for hikers' bus fees, schedule, and reservations.
Yosemite National Park offers a free shuttle bus around the east end of Yosemite valley to all visitors. Use it! It reduces pollution and traffic jams that often result in the crowded summer months. Be prepared for standing room only. During the winter, usually only 2 or 3 buses run at a time so be prepared for a wait of 15 minutes or more if you just miss the bus. I found in the winter it's faster to walk from place to place than to wait for the bus. During the summer, 10 or more busses run reducing the wait time to within just a few minutes.
Yosemite is yet another National Park that can help get you around. Just check out a shuttle schedule and enjoy the scenery and ride.