Guests under 18 must be accompanied by an adult older than 21 at all times.
Trees along the fence line bordering Route 837 have been cut to improve sight lines. New floodlights and ongoing security patrols in the area will also increase, park leaders said.
Kennywood leaders said their weapons detection system that was in place Saturday would remain in place. As a precaution, the park will implement additional spot-checking of bags.
The park revealed a new bag policy. Starting Friday, only bags 8 inches by 5 inches by 1 inch and medical and diaper bags are allowed in the park.