In a built-up area, a bus starts indicating to pull away from a designated curbside stop (marked by sign 5.12). What is the duty of drivers traveling in the adjacent right lane?

1. Maintain speed because moving traffic always has priority over pulling-out buses.
2. Slow down and yield right of way to enable the bus to merge into traffic.
3. Sound the horn to warn the bus driver not to enter the lane.
4. Quickly swerve into the oncoming lane to bypass the bus.