State regulators say Six Flags Over Georgia must increase the size and number of warning signs near a popular roller coaster that hit and killed a teen.

Police say 17-year-old Asia LeeShawn Ferguson IV of Columbia, S.C. scaled two fences and wandered into a restricted area where he was decapitated by the roller coaster.

The Batman ride reopened Wednesday following the Saturday accident. But State Labor Commissioner Michael Thurmond says the park must make signs bigger, post more of them and add the words "extreme danger" within 10 days.