What should drivers in an emergency situation on the highway avoid doing while the vehicle is still moving?

Turning off the vehicle while it is still moving can lead to a loss of control, as power steering and braking systems may become ineffective. The engine's operation is essential for maintaining vehicle control and ensuring that critical systems function properly. In an emergency situation, keeping the vehicle operable allows the driver to react appropriately, whether that means steering to avoid an obstacle or using brakes effectively. Therefore, maintaining vehicle power is crucial for safety.

The other options involve behaviors that may also jeopardize safety, such as distracting oneself with a telecommunications device, which can divert attention from the road. Changing lanes abruptly can cause confusion for other drivers and increase the risk of collisions. Accelerating rapidly may lead to losing control or worsening the situation if quick maneuvers are needed. However, the specific danger associated with turning off the vehicle while moving makes it a critical point of focus.