On a road posted at 60 km/h, a school crossing guard raises the prescribed upright school crossing stop sign. When may an approaching driver who has stopped proceed?

Объяснение

The displayed school-crossing sign triggers a stop that lasts until all people, including the guard, are off the roadway and proceeding is safe. Waiting only until children reach the centre line leaves both people and the guard exposed, so it does not satisfy the release condition.