YELLOWSTONE NATIONAL PARK, Wyo. (AP) — Some roads in Yellowstone National Park have opened to bicyclists willing to brave the unpredictable spring weather and other potential hazards.

On Friday, 49 miles of park roads from the West Entrance to Mammoth Hot Springs were opened to bicyclists.

As conditions allow, bicycles will also be permitted from the East Entrance to the east end of Sylvan Pass, and the South Entrance to West Thumb.

There is no bicycle access to Old Faithful or Canyon until those interior park roads open to public motorized vehicle access on April 19. Electric or pedal-assist bikes are not allowed on park roads when they are closed to motorized, public travel.

The National Park Service warns bicyclists to look out for changing weather conditions, snowplows, wildlife and other hazards.