To help other drivers notice you when slowing down, what should you do?

Flashing your brake lights is an effective way to communicate your intention to slow down to other drivers. By doing so, you increase visibility and alert those behind you that you are decreasing speed. This can help prevent rear-end collisions, as it gives drivers a clear signal to prepare for your change in speed.

While turning on hazards or signaling left or right can also make you more noticeable, they are not as directly related to indicating a decrease in speed. Using the hazards is typically reserved for emergencies, and signaling left or right is used to indicate a turn rather than slowing down. Riding in a different lane does not effectively alert other drivers that you are slowing down, and could potentially confuse them instead.