Final answer:
To signal that you plan to brake soon, you should use your vehicle's brake lights by pressing the brake pedal, which will illuminate them. Optionally, you can tap the brake pedal lightly to flash the lights before braking firmly or use hand signals where appropriate.
Step-by-step explanation:
To signal the vehicle behind you that you plan to brake soon, you can use several methods. The most common and direct way is to use your vehicle's brake lights.
When you press the brake pedal, the brake lights illuminate, indicating to drivers behind you that your speed is reducing and you are preparing to stop. It is also good practice to ensure that your brake lights are properly functioning to avoid any miscommunication.
Another technique is to lightly tap the brake pedal, making the brake lights flash as a warning before you apply the brakes more firmly. This is especially useful if you are going to brake suddenly or earlier than the following driver may anticipate. Additionally, if the situation allows, decelerating gently over a longer distance can give drivers behind more time to react before you actually apply the brakes.
In situations where the brake lights may not be sufficient to warn drivers, especially in daylight or with a faulty system, hand signals can be employed, though they should only be used if they are clearly understood and legal in your area.