35.3. Reduction of the braking distance of a vehicle is achieved by:
UAЗменшення гальмового шляху транспортного засобу досягається:
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This exam question from the Traffic Rules of Ukraine concerns the safe operation of a vehicle during deceleration and stopping. On the road, it is crucial not only to press the brakes, but also to maintain tire grip with the surface: this determines the length of the braking distance, the risk of skidding, and the ability to avoid obstacles. That is why the topic of effective braking is key for preparing for the theoretical exam and for everyday road safety.
The question tests understanding of the term "braking distance" from point 1.10 of the traffic rules and the practical logic of emergency braking. The idea is that maximum deceleration is achieved at the limit of traction: when the wheels are still rotating but almost ready to lock. Intermittent pressing of the brake pedal helps maintain this mode, preventing prolonged skidding, and essentially imitates the operation of ABS on vehicles without an anti-lock braking system.
The option of braking "in a skid" (locking the wheels) usually worsens the result: when sliding, grip with the road decreases, controllability drops sharply, and the braking distance often increases, especially on wet or slippery surfaces. In contrast, braking at the threshold of locking with intermittent pedal pressure allows you to use the maximum available grip and at the same time maintain control over the direction of movement, which directly corresponds to the idea of the Traffic Rules of Ukraine regarding safe speed reduction in danger (in particular, according to the content of point 12.3).
Clause 1.10 (term “Braking distance”)
Braking distance — the distance traveled by a vehicle during emergency braking, starting from the moment the brake control (pedal, lever) is actuated until the vehicle comes to a stop.
This question checks the understanding that the “braking distance” specifically refers to the emergency braking phase after the brake control is pressed, and therefore depends on the effectiveness of braking (in particular, on preventing prolonged wheel lock-up and loss of traction).
Clause 1.10 (term “Stopping distance”)
Stopping distance — the distance a vehicle travels from the moment a hazard or obstacle appears, which the driver can objectively detect, to the point where the vehicle comes to a stop.
The question is also indirectly related to this term: in order to stop within the stopping distance, the driver must ensure maximum effective deceleration specifically during the “braking distance” phase (without unnecessary skidding).
Clause 12.3
In the event of a hazard or obstacle that the driver can objectively detect, they must immediately take measures to reduce speed up to stopping the vehicle, or safely maneuver around the obstacle for other road users.
This clause of the Traffic Rules establishes the driver’s obligation to immediately reduce speed up to a stop. The exam question essentially checks practical understanding of how to achieve the most effective deceleration (minimizing braking distance) during emergency braking — by braking at the threshold of wheel lock-up.
That is, the correct answer is “Braking at the threshold of wheel lock-up by intermittently pressing the brake pedal,” given that according to the definition in the Traffic Rules, braking distance is the distance during emergency braking from the moment the brakes are applied to a complete stop, and the driver is obliged by the Traffic Rules to immediately reduce speed up to a stop in case of danger, so the method that ensures the most effective deceleration without prolonged wheel lock-up is used.
The braking (brake) distance in the Traffic Rules is defined as the distance a vehicle travels during emergency braking from the moment the brake pedal (or other brake control) is pressed until it comes to a complete stop. That is, we are not interested in 'how hard to press,' but in how to achieve the greatest deceleration on the available surface while maintaining control.
During braking, deceleration occurs thanks to the friction force between the tires and the road. However, this force has a limit: it is restricted by the grip of the wheels on the surface. If you press the pedal excessively and exceed the grip capabilities, the wheels lock and start to skid (a skid occurs). In this mode, the tire no longer 'grips' the road as it does during rolling, but slides over it, which reduces traction, makes the vehicle less stable, and usually results in a longer stopping distance, especially on slippery surfaces. Additionally, controllability worsens: with locked wheels, it is harder to maintain the desired direction and avoid obstacles.
The shortest braking distance is achieved when the wheels are still rotating but are already working at the limit of grip, that is, they are almost about to lock. This is called 'threshold braking': the driver quickly increases the braking force, senses the onset of a skid (or its signs), and immediately reduces the pressure, then presses again. Such intermittent pressing essentially keeps the wheels at the maximum possible grip, preventing them from skidding for long. A simple example: on wet asphalt, with the pedal 'pressed down,' the car may start to skid and slide further, but with intermittent pressing, the wheels resume rotating, and braking becomes more effective and controllable.
That is why the option 'just press all the way down' is not a universal way to shorten the distance: if this leads to wheel lock, the braking distance increases and the risk of skidding grows. Instead, threshold braking with intermittent pedal pressing allows you to use the maximum grip and avoid prolonged skidding, which shortens the stopping distance (in vehicles without ABS, this is exactly how the driver imitates the system, which automatically prevents locking).
Therefore, the correct answer is 'Threshold braking by intermittently pressing the brake pedal,' because the shortest braking distance is achieved with maximum tire-to-road grip without wheel lock, and intermittent pressing keeps braking at this threshold and prevents skidding.