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Difficulty: MediumTire Failure and Blowouts

Upon identifying a sudden tire blowout on an open roadway, the driver should immediately depress the service brake pedal firmly to bring the vehicle to an abrupt stop before directional control is lost.

Answer: Answer

Answer

False (Commercial drivers must stay off the service brake immediately following a blowout and allow the vehicle to coast down naturally before applying light, controlled braking).
During an active tire blowout, the immediate application of service brakes can cause catastrophic loss of vehicle control, jackknifing, or a rollover due to uneven traction and tire drag. The proper commercial driving procedure is to maintain a secure two-handed grip on the steering wheel to keep the vehicle in its lane, stay completely off the brake pedal, allow the vehicle to coast down to a safe speed, and only then apply light, gentle braking to guide the vehicle onto the shoulder.

Step-by-Step Solution

1
Evaluate the immediate physical risks associated with a sudden tire blowout at travel speed.
The blown tire creates significant asymmetric rolling resistance and reduces lateral traction on that wheel position.
Understanding the dynamic imbalance explains why abrupt control inputs destabilize the entire vehicle.
2
Analyze the effect of immediate hard service braking during a tire failure.
Hard braking locks the damaged wheel or induces severe pull, causing an immediate skid, jackknife, or rollover.
The vehicle requires forward momentum and steady rolling friction on the remaining tires to maintain steering control.
3
Determine the proper CDL emergency protocol.
Maintain a steady hold on the steering wheel, stay completely off the brake, allow the vehicle to coast down, and then brake gently to stop off the roadway.
Coasting allows the vehicle to bleed off speed safely without provoking directional instability.

Key Concept

Emergency response protocol for a tire blowout: maintaining directional control and staying off the service brake until the vehicle slows down naturally.
Estimated Time:45s
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Topics

Tire Failure and Blowouts

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