Nine climate change activists have been arrested, including two who glued themselves to the road and blocked an intersection, during this week's final "swarming" protest in Brisbane.

However, the police crackdown on the activists' tactics of blockading CBD intersections kept traffic delays to a minimum during the Wednesday morning peak-hour.

The Extinction Rebellion group, responsible for a previous Victoria Bridge protest and the past two intersection blockades, chanted as they marched through the heart of the River City.

Two activists, separate from the 25-strong main group, glued themselves to Countess Street, near the intersection with Secombe Street, and blocked it about 8am.