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Zorluk: Çok zorSpeed and Road Conditions

According to standard commercial driving safety rules regarding surface traction, an operator traveling at a normal dry-road speed of 60 mph60\text{ mph} is required to reduce their speed to 30 mph30\text{ mph} on wet pavement, and to 40 mph40\text{ mph} on a roadway covered with packed snow.

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False
The correct answer is False because the statement inverses the required speed reductions. To maintain safe stopping distances, a commercial driver must reduce their normal speed by one-third on wet pavement (60 mph60\text{ mph} becomes 40 mph40\text{ mph}) and by one-half on packed snow (60 mph60\text{ mph} becomes 30 mph30\text{ mph}).

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1
Identify the standard CDL speed reduction ratio for wet pavement.
Commercial driving rules require reducing speed by about one-third when driving on wet roads.
This establishes the mathematical baseline needed to evaluate the first half of the statement.
2
Calculate the correct target speed for wet pavement based on the scenario.
Reducing a 60 mph60\text{ mph} normal speed by one-third (a 20 mph20\text{ mph} reduction) yields a safe speed of 40 mph40\text{ mph}.
This contradicts the statement's claim that the speed must be reduced to 30 mph30\text{ mph} on wet pavement.
3
Calculate the correct target speed for packed snow.
The rule for packed snow requires a speed reduction of one-half or more. Reducing 60 mph60\text{ mph} by one-half yields a safe speed of 30 mph30\text{ mph}.
This confirms the statement has completely reversed the required speeds for wet pavement and packed snow.

Anahtar Kavram

Traction-Based Speed Reduction Ratios
Tahmini Süre:1m 0s
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Konular

Speed and Road Conditions

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