What should vehicles not do when a bus is signaling to leave a bus stop?

When a bus is signaling to leave a bus stop, vehicles should not impede or interfere with the bus. This is because buses are often larger and have specific safety protocols they must follow when re-entering traffic. Allowing the bus to safely merge back into the roadway is crucial for the safety of all road users, including passengers getting off the bus and other vehicles on the road. A driver's responsibility is to ensure that the bus has enough space and time to maneuver safely, which helps prevent accidents.

Vehicle drivers should be mindful of the bus's need to adhere to the traffic flow and avoid behaviors that can cause delays or hazardous situations. Other options like speeding up to pass the bus or changing lanes aggressively not only threaten safety but can also lead to traffic violations. Stopping at the bus stop can be the correct action, provided the bus is stationary, and the law mandates it when passengers are present; however, the key issue in the context of the question is to avoid actions that obstruct the bus when it signals to leave.