A freight transport combination with an overall vehicle length of 65\text{ feet} is travel… — Commercial Driver's License (CDL) General Knowledge Exam

A freight transport combination with an overall vehicle length of $65\text{ feet}$ is traveling at a steady cruising speed of $50\text{ mph}$ on a clear, dry highway. According to commercial driving safety guidelines, what is the minimum safe following distance the driver should maintain behind the lead vehicle?

A
$6.5\text{ seconds}$
B
$8.5\text{ seconds}$
$7.5\text{ seconds}$ Cevap
D
$2.0\text{ seconds}$

Cevap

7.5\text{ seconds}

The standard commercial vehicle rule requires

1\text{ second}

of following distance for every

10\text{ feet}

of vehicle length, plus an additional

1\text{ second}

when traveling at or above

40\text{ mph}

. For a

65\text{-foot}

combination vehicle traveling at

50\text{ mph}

, the base time is

6.5\text{ seconds}

(

65 \div 10

) plus

1.0\text{ second}

for the speed condition, totaling a minimum safe following interval of

7.5\text{ seconds}

Adım Adım Çözüm

Calculate base following time from vehicle length.

\frac{65\text{ ft}}{10\text{ ft/s}} = 6.5\text{ seconds}

Commercial driving standards require 1 second of following distance for every 10 feet of vehicle length at speeds under

40\text{ mph}

Evaluate operating speed to determine if an extra safety buffer is required.

Add

1.0\text{ second}

because

50\text{ mph} \geq 40\text{ mph}

At speeds of

40\text{ mph}

or higher, stopping distance increases significantly, requiring 1 additional second to be added to the base interval.

Sum the vehicle length allowance and the speed safety cushion.

6.5\text{ seconds} + 1.0\text{ second} = 7.5\text{ seconds}

The total required cushion equals the base length calculation plus the high-speed increment.

Anahtar Kavram

CDL Following Distance Formula (1 second per 10 feet of length under 40 mph, plus 1 second for 40+ mph)

Tahmini Süre:1m 0s

Soru

Cevap

Adım Adım Çözüm

Anahtar Kavram

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