Examkin

Soru

Zorluk: Çok zorTraffic Calming and Road Surfaces

While navigating a historic town centre during a heavy downpour, you enter a traffic-calmed zone where the standard asphalt transitions abruptly to decorative block paving (cobblestones). An unexpected hazard forces you to brake sharply. Assuming your vehicle is equipped with an Anti-lock Braking System (ABS), how does this specific combination of road surface and weather interact with your braking system, and what handling outcome should you anticipate?

  1. The wet block paving provides significantly less grip than asphalt, causing the ABS to activate earlier; however, because the tyres may momentarily bounce on the uneven surface, your overall braking distance is likely to increase.Cevap
  2. B
    If the vehicle begins to skid on the slippery paving, you should immediately apply heavy, manual cadence braking while steering sharply away from the direction of the skid.
  3. C
    The ABS guarantees that your braking distance on the wet block paving will remain identical to standard dry conditions, provided you maintained the normal two-second separation gap.
  4. D
    To maximize tyre grip on the uneven cobblestones during heavy braking, you should immediately depress the clutch pedal to coast, removing engine braking interference.

Cevap

The wet block paving provides significantly less grip than asphalt, causing the ABS to activate earlier; however, because the tyres may momentarily bounce on the uneven surface, your overall braking distance is likely to increase.
Block paving (cobblestones) is a common traffic calming surface that offers substantially less friction than standard asphalt, especially when wet. When braking heavily on this highly uneven surface, a vehicle's tyres can momentarily bounce off the ridges, breaking contact with the road. Because Anti-lock Braking Systems (ABS) require continuous tyre contact to calculate wheel speed accurately, this bouncing effect causes the system to release brake pressure repeatedly. Consequently, while the ABS effectively prevents wheel lock-up and allows you to steer, the total braking distance is significantly increased compared to braking on a smooth, wet road.

Adım Adım Çözüm

1
Analyze the change in road surface characteristics from standard asphalt to block paving (cobblestones) in wet conditions.
Recognize that block paving is inherently more slippery than standard tarmac, particularly when wet, which immediately reduces the available traction.
Different road surfaces have varying friction coefficients, and recognizing these shifts is essential for anticipating vehicle handling changes.
2
Evaluate the mechanical effect of the uneven surface on the Anti-lock Braking System (ABS).
Determine that while ABS prevents wheel lock-up, the uneven ridges of the cobblestones can cause the tyres to momentarily bounce and lose contact with the road.
ABS relies on continuous sensor readings and constant tyre contact; airborne or bouncing tyres confuse the system, causing it to release brake pressure.
3
Synthesize the surface conditions with the braking mechanics to determine the final handling outcome.
Conclude that the combination of reduced grip from the wet paving and intermittent tyre contact from the uneven surface will result in a significantly increased overall braking distance compared to smooth asphalt.
Understanding the limitations of vehicle safety systems in complex environments is a critical high-level hazard awareness skill.

Anahtar Kavram

Interaction between uneven road surfaces, wet weather, and Anti-lock Braking Systems (ABS)
Bu soruyu puanla

Konular

Traffic Calming and Road Surfaces

Bu konudan daha fazla soru