Does the bus driver have to give a warning signal before changing lanes?
Immediately before starting the maneuver.
Immediately after the start of the maneuver.
In advance - before the start of the maneuver.✓Correct answer
Not obliged, if the bus is moving along the established route.
Explanation
A lane-change signal must be given early enough for nearby drivers to understand the intention and react before lateral movement begins. Signalling only as the bus moves, or after it has already crossed toward the next lane, defeats that warning purpose.