You are driving a freight transport combination on a two-lane highway with a posted speed limit of where recent winter weather has covered the roadway in packed snow. As you approach a sharp downhill curve, which combination of speed adjustment and auxiliary braking control must you execute to maintain traction and stability?
- ASlow the vehicle to before the bend, but activate the engine retarder on its highest setting to assist drive-axle deceleration.
- Slow the vehicle down to at least prior to entering the curve and ensure the engine retarder is turned off.Cevap
- CMaintain cruising speed until reaching the bend, then apply continuous service braking throughout the arc of the turn.
- DReduce speed by one-third to before the curve, calculating stopping distance using vehicle braking distance alone.
Cevap
Slow the vehicle down to at least prior to entering the curve and ensure the engine retarder is turned off.
On roadways covered with packed snow, commercial drivers must reduce travel speed by at least half (from down to or less). This deceleration must be completed before entering the curve to prevent skidding during cornering. Furthermore, engine retarders must always be disabled whenever road surfaces are slippery (wet, snowy, or icy) because their braking torque can break drive-wheel traction.
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Anahtar Kavram
Speed reduction on packed snow requires slowing down by half or more before entering curves and disabling engine retarders to prevent drive-wheel traction loss.
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