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The local amusement park announced the reactivation of its chaperone policy on social Monday.

According to the policy, all guests 15 and younger must be with a parent, guardian or adult chaperone 21 or older to enter the park starting at 4 p.m. Six Flags noted, though, that it may start the requirement earlier than for 4 p.m. on occasion.

One adult chaperone may supervise no more than 10 kids per day. The chaperone must be with their guests at entry, remain inside the park and be available by phone. Children found without a chaperone can be removed from the park, according to the policy.

The policy goes into effect Thursday. Six Flags ÃÛÑ¿´«Ã½ is open from 11 a.m. to 8 p.m. on weekdays and from 11 a.m. to 9 p.m. on weekends. It is unclear if the policy is just for the park’s summer KidZfest weekend events or if the chaperone policy will be a permanent fixture for the rest of the season.

Six Flags ÃÛÑ¿´«Ã½ had previously enacted the rule last fall during its Fright Fest events.

Six Flags Great America in Gurnee, Illinois, and Six Flags Over Texas in Arlington, Texas, have also recently announced the reinstatement of the chaperone policy at the parks. Six Flags Over Texas cited “increasing incidents of unruly and inappropriate behavior at amusement parks and other major entertainment venues,� according to a news report.

Six Flags did not immediately respond to a request for comment on the policy at the ÃÛÑ¿´«Ã½ park.

Last , police arrested a ÃÛÑ¿´«Ã½ man and woman after they allegedly assaulted a woman in line for a ride at the amusement park.

And in , an Illinois man was arrested for assaulting a park employee who was dressed up as Daffy Duck.