from roadbikerider.com

Commercial downhill bike rides in Maui’s Haleakala National Park may be aloha, as in goodbye. The National Park Service temporarily stopped the activity last fall and will decide next month whether to make the ban permanent. Reason: Three people died in accidents on the descent last year, making the rides one of the most "high-risk activities" at national parks, along with climbing Mount Rainier and rafting and mule riding in the Grand Canyon. About 90,000 tourists per year pay $100 to $150 for the coast down Haleakala, the world’s largest dormant volcano. They are driven by a van to the 10,000-foot summit, then descend for about 38 miles (61 km) along a curvy two-lane highway. Seven companies have permits to conduct bike tours through the park. The ban, if it happens, is not expected to apply to non-commercial cycling, which increased slightly in the park following the commercial suspension. Accident statistics aren’t kept on independent riders.

I rode down in October 2001. The tour company I was with paid a lot of attention to safety.