When is it MOST important to flash your brake lights?

Flashing your brake lights is most important when you will be slowing suddenly because it serves as a critical warning to other drivers behind you. This action alerts them that you are decelerating quickly and may need to come to a complete stop, thereby reducing the risk of a collision. By signaling your intent to slow down, you give them the opportunity to adjust their speed accordingly.

In contrast, while it can be helpful to use brake lights in other scenarios, such as when changing lanes or making a turn, the urgency and importance of signaling slowing suddenly hold a higher priority, as this is a more immediate hazard for drivers following behind. This practice enhances overall road safety and contributes to better communication between motorists.