DEADWOOD, S.D. -

The sister of a 64-year-old Sturgis woman who was badly injured in a motorcycle crash near Deadwood says a herd of bighorn sheep presents a danger to motorists.

The collision occurred on Sept. 8 as 60-year-old Sheryl Hicks and her sister Esther Parks crested a hill on U.S. Highway 85 and ran into traffic stalled for sheep on the road. Parks lost control and was thrown from her motorcycle, leaving her badly injured.

Hicks says the incident should be a wake-up call to wildlife and transportation officials, and asks that more be done to regulate the sheep.

Deadwood police say speed may have been the factor in the collision, and note there is adequate signage warning people about the animals.

A state transportation engineer says lights will be added to the sheep warning sign north of the accident site.