PROVO — Utah County longboarders, your worst nightmare is about to come true.

The Provo River Parkway in Provo Canyon — and all other Utah County-run trails, for that matter — is about to become off-limits to skateboarding, longboarding and other similar sports.

Skate- and longboarders will no longer be allowed to ride on the county's trail system because of safety issues, according to an ordinance unanimously approved Wednesday by the Utah County Commission. Bicycles and roller skates are still permitted, but a 15 mph speed limit will be imposed and enforced on those devices.

"The main issue I see here is we're talking about those things that don't have any brakes, because there have been problems with bicycles on the trail as well, but we're not eliminating those," said Commissioner Larry Ellertson. "I hate to take away more and more freedom of people, yet safety is premier, and we need to be safe with these things."

The ordinance, which will become effective as soon as Aug. 10, was inspired by an accident that happened on the asphalt trail by the Provo River — a mecca for those who love to longboard — in the beginning of July.

According to Paul Hawker, associate Utah County engineer and county traffic investigator, on July 1 an accident occurred between a group of longboarders who were coming down the trail and a group of sightseers who were walking up the trail. The longboarders were not able to avoid the group of people, and subsequently a child was injured and taken to the hospital.

On that day, the officer who handled the accident warned the group of longboarders — about 70 of them, Hawker says — that they could lose their right to ride in the canyon. Since then, rumors in the longboarding community have circulated on blogs and other Web sites that the ordinance was imminent.

"The safety concern is, now we know that there have been problems, and we can't just ignore it," Ellertson said.

Hawker said at least four written complaints about longboarders on the trail have been received by the county in the past three months. The complaints have added to the county's desire to avoid future accidents, because of the thousands of people who use the trail on a daily basis, longboarders are in the minority, Hawker says.

"You go up there in the midmorning and there are women with strollers that are using (the trail)," Hawker said. "You'll see the joggers, the bicycler and the runners. In the late afternoon, you'll see a lot of walkers and people who just want to get out of the heat. We have thousands of people up there, and I don't see longboarders in the majority."

The county ordinance applies to all of the county's trails, including other popular skateboarding areas in Hobble Creek Canyon and along the Jordan River.