WHITEFISH, Mont. — This past month was Glacier National Park’s second-busiest May on record after an estimated 177,256 people visited the park.

The National Park Service states Glacier is on track to compete with last year’s annual visitation record of 2.94 million people. May 2016 had roughly 6,600 more visitors than this year.

The Going-to-the-Sun Road is a prime driver of visitation, and access continues to expand following its seasonal closure. The road is almost fully cleared. Last year, the park service opened the full 50 miles (80 kilometers) of road on June 16.