38.13. The braking distance on the road immediately after rain:
UAГальмівний шлях на дорозі одразу після дощу:
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This is an exam question from the Traffic Rules of Ukraine concerning road safety in difficult weather conditions and tests the understanding of how the road surface condition affects the ability to stop a vehicle in time. Situations "after rain" are often included in the theoretical exam because it is at this time that drivers underestimate the slipperiness of the road and the risk of accidents due to incorrectly chosen speed and distance.
The question tests knowledge of the sections of the traffic rules about safe speed and choosing speed according to driving conditions (the term "safe speed" in point 1.10, as well as the requirements of point 12.1), as well as maintaining a safe distance (point 13.1). Immediately after rain, tire grip with the road deteriorates: water mixes with dust and dirt, forming a slippery film that causes the wheels to "hold" the asphalt less effectively. Therefore, during braking, the car slows down for longer and requires a greater distance to come to a complete stop; puddles are additionally dangerous, where partial sliding on water and temporary worsening of braking are possible.
In this context, the correct statement is that the braking distance increases: this directly follows from the reduced grip on wet pavement and is consistent with the traffic rules' requirements to choose speed "according to the situation." Options about a decrease or no change are incorrect, as they ignore the physics of tire-road contact and the real danger in the first minutes after precipitation, when the surface is often the most slippery. The practical conclusion for the driver: reduce speed in advance, increase distance, and avoid sharp braking and maneuvers on a wet road.
Clause 1.10 (term “Safe speed”)
Safe speed is the speed at which the driver is able to safely control the vehicle and stop it in time within the visible road area (taking into account the traffic situation, road surface condition, and tire-to-road grip).
Brief application: immediately after rain, tire grip on the road worsens, so to maintain “safe speed,” a greater distance and lower speed are needed, because stopping/braking requires a longer distance.
Clause 12.1
When choosing a safe driving speed within the established limits, the driver must take into account the traffic situation, the characteristics of the cargo being transported, and the condition of the vehicle, in order to be able to constantly control its movement and drive it safely.
Brief application: wet pavement (especially immediately after rain, when a slippery film forms) is an element of the traffic situation/driving conditions that requires a reduction in speed, otherwise stopping will require a longer distance.
Clause 13.1
Depending on the driving speed, traffic situation, characteristics of the cargo being transported, and the condition of the vehicle, the driver must maintain a safe distance to the vehicle ahead.
Brief application: an increase in braking distance on a wet road directly means the need to increase the safe distance.
Clause 2.3 (subclause “b”)
To ensure road safety, the driver is obliged to be attentive, monitor the traffic situation, respond appropriately to its changes, monitor the correct placement and securing of cargo, the technical condition of the vehicle, and not be distracted from driving this vehicle on the road.
Brief application: a change in the road surface condition after rain is a change in the traffic situation, to which the driver must respond (by reducing speed, braking smoothly), considering the longer braking distance.
Therefore, the correct answer is “Increases,” given that according to the definition in the Traffic Rules, the driver must choose a safe speed and distance taking into account the traffic situation and road surface condition, and on a wet road, grip is worse and a longer distance is needed to stop.
Immediately after rain, the road surface becomes more slippery than in dry weather. A thin layer of water appears on the asphalt, which often mixes with dust and dirt and acts as a film that worsens the contact between the tires and the road. Because of this, the wheels grip the surface less effectively, and therefore a longer distance is needed to stop.
The Traffic Rules state that the driver must choose a safe speed taking into account the condition of the roadway and weather conditions, so as to be able to constantly control the movement of the vehicle and stop safely. When traction decreases, even at the same speed, the car slows down for a longer time, and the braking distance increases. That is why in such conditions it is necessary to reduce speed in advance and increase the following distance.
Puddles create additional danger: in them, partial "floating" of the tires on water is possible, which sharply reduces braking efficiency. Also, after driving through water, the braking mechanisms may temporarily work less effectively until they dry out, which also increases the distance to a complete stop.
Therefore, the correct answer is "Increases," because after rain, tire grip with the road decreases due to water and the slippery film, and in puddles, additional deterioration of braking efficiency is possible.