HILO, Hawai'i — Illegal off-roading is causing problems on the summit of Mauna Kea.

Department of Land and Natural Resources Chairwoman Laura H. Thielen said warning signs are being ignored and that illegal riding is taking place off the R-1 and R-10 roads, including climbing of Kanakaleonui cinder cone, 12 miles in from Hale Pohaku.

She said the vehicles are leaving tracks that will scar the area for years.

"Our Forestry and Wildlife staff has many responsibilities but their major responsibility is to protect the resources. If the illegal activity, which is damaging natural resources, doesn't stop, they will have no choice but to close the R-1 and R-10 to recreational riding," she said in a news release.

The area has long been open to hunters using dirt bikes, four-wheel-drive vehicles and all-terrain vehicles. In April 2007, DLNR opened up the R-1 and R-10 roads for use by recreational riders.

As a condition of being allowed to ride in the scenic natural area, off-highway vehicle operators and riders are required to follow rules listed in the Division of Forestry and Wildlife Permit and Recreational Guide.

All drivers are prohibited from cross-country traveling and hill climbing. Violators risk having their riding privileges revoked and fines of up to $500 and up to 30 days in jail.

To report violations, call the Division of Conservation and Resource Enforcement at 643-DLNR (3567). Permits, waivers and recreational guides are available at the Division of Forestry and Wildlife office at 19 E. Kawili St. in Hilo.

For information call 974-4221; in Waimea go to 66-1220A Lalamilo Road, or call 887-6063.