Brisbane high school teacher Olivia Williams, 21, was greeted with applause by fellow activists as she exited the Brisbane city watchhouse.

“My concern is for my students’ futures which was my main motivation for taking this action today,” she said outside.

Ms Williams was charged with obstructing traffic when she allegedly stormed an intersection about noon.

She said she found police behaviour “fair for the most part” but had heard from friends there had been some “rough handing”.