Arch Rock Traffic Metering Pilot

Yosemite National Park is launching a pilot program to address traffic congestion at Arch Rock Entrance. The program will be tested on Highway 140 on Saturdays in May. This pilot is an initiative to test a new way to pace and send vehicles to Arch Rock Entrance, improving visitor safety and access while enhancing the overall visitor experience on busy traffic days.

Working with Caltrans and the California Highway Patrol, vehicles entering the park via Highway 140 will be queued in El Portal and sent incrementally to Arch Rock Entrance. This will greatly reduce the number of vehicles stopped in a rockfall zone along El Portal Road, enhancing visitor safety and access to the park. The anticipated times of operation are from approximately 9 am to 2 pm.

Why is Yosemite National Park piloting traffic metering outside the park before Arch Rock Entrance?

Arch Rock Entrance Station is not designed to accommodate the volume of vehicles it receives, causing vehicles to back up several miles. This pilot is meant to move this backup out of an area with a higher rockfall risk, give emergency vehicles the ability to bypass traffic, and enable administrative vehicles to reduce their travel time, thus increasing operational efficiency of the park.

When is the Arch Rock bypass scheduled to take place?

Every Saturday in May, 2018, Yosemite National Park is testing a pilot program to improve safety for pedestrians and motorists and increase efficiency for park operations and alternative modes of transit. Expect the bypass to be in effect from approximately 9 am to 2 pm for each day of the pilot.

How will this impact my visit to Yosemite?

Vehicles entering the park via Highway 140 will be queued in El Portal, approximately five miles east of the Ferguson slide bridges. Vehicles will be incrementally sent to the entrance station to allow for short delays at the Arch Rock Entrance Station. This pilot should not affect the overall length of delays.

Where will the pilot be taking place?

The pilot zone will be along a three-mile stretch of Highway 140 from the intersection of Foresta Road to the intersection of El Portal Road.

How will park staff differentiate who waited in the queue and utilized the bypass?

Visitors waiting in the queue will be given a token; this token will be turned in at the park boundary to allow entry. Those guests who used the bypass and do not have a token will be turned around at the park boundary and forced to return to the end of the queue.

During this pilot, how will this impact motorists exiting Yosemite Valley via Highway 140?

Please pay close attention to the posted speed limit and construction signs. Because traffic in the inbound lane along Highway 140 may be stopped, all vehicles should use extra caution and pay close attention for pedestrians as they travel in the outbound lane.

I’m visiting Yosemite using YARTS. How will this impact my travel time?

Visitors who plan to travel to Yosemite Valley using the Yosemite Area Regional Transportation System (YARTS) should expect this bypass to enable buses to be on time as they will be able to bypass the traffic queue. Please review the YARTS schedule at for a complete listing of schedules.

Last updated: May 2, 2018

Contact the Park

Mailing Address:

PO Box 577
Yosemite National Park, CA 95389


(209) 372-0200

Contact Us