Moose-Wilson Road Corridor Carrying Capacity: 550 People

December 20, 2015

Grand Teton National Park officials are not proposing to lower the number of people that can travel the Moose-Wilson Road corridor at any one time, but rather believe they have the tools to lessen their impact.

Through better designed parking areas, paving an unpaved section of the road, designated pullouts, and reduced speed limits park officials believe the current peak capacity of 550 people in the corridor can be handled without impacting the resources in the area.

Studies by the Federal Highways Administration "showed that average traffic volume in the corridor during the busiest times of the year was approximately 200 vehicles at one time," park officials said in a release looking at the road corridor. By using a 2.7-person mulitplier per vehicle, the staff came up with the 550 capacity limit.

The studies, based on 2013 traffic flows, showed that August was the most popular month for driving the scenic corridor that stretches from park headquarters at Moose to Wilson and Teton Village, with 198 vehicles on average in the corridor at any one time.

If the park resorted to a queuing system to control the number of vehicles on the road at any one time, "a wait would occur on 20 to 25 days of the season. These short waits (7-11 minutes on average) would only occur during the middle of the day, from roughly 11:00 a.m. to 4:00 p.m. The queuing lanes would be designed to accommodate all waiting vehicles within the park."

However, the officials noted, if a queuing system was needed due to traffic patterns, park visitors might alter their behavior and avoid the road corridor during the busiest times of the day.

"The Draft Plan/EIS allows for adaptive management of the capacity. Through monitoring, if it is determined that observed conditions do not match desired conditions for the corridor, the National Park Service could adjust the capacity either up or down in order to meet the goals of the plan."

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