You are driving on a two-lane road. A school bus with flashing red lights is stopped ahead. What must you do?

In Wyoming, if a school bus has stopped with its red lights flashing, vehicles traveling in either direction must stop before reaching the school bus. They must remain stopped until the red lights have been switched off or the school bus has resumed its motion. [Required Stops, Braking/Stopping, Rules of the Road, Wyoming Rules of the Road]