A driver is operating a 55\text{-foot} commercial combination vehicle at a steady speed of… — Commercial Driver's License (CDL) General Knowledge Exam

A driver is operating a $55\text{-foot}$ commercial combination vehicle at a steady speed of $35\text{ mph}$ along a dry multi-lane arterial roadway. According to the standard CDL following distance formula under good road conditions, what is the minimum safe following distance the driver must maintain behind the lead vehicle?

$5.5\text{ seconds}$ Cevap
B
$6.5\text{ seconds}$
C
$4.5\text{ seconds}$
D
$2.0\text{ seconds}$

Cevap

5.5\text{ seconds}

Under standard CDL guidelines for speeds below

40\text{ mph}

, drivers should maintain at least

1\text{ second}

of following distance for each

10\text{ feet}

of vehicle length. For a

55\text{-foot}

combination vehicle, this requires

5.5\text{ seconds}

. Because the vehicle is traveling at

35\text{ mph}

(below

40\text{ mph}

), no additional second is added.

Adım Adım Çözüm

Calculate base following distance from total vehicle length

55\text{ ft} / 10 = 5.5\text{ seconds}

The commercial driving standard allocates

1\text{ second}

for every

10\text{ feet}

of vehicle length.

Evaluate operating speed for the high-speed adjustment

Speed is

35\text{ mph}

, which is below

40\text{ mph}

, adding

0\text{ seconds}

An extra

1\text{ second}

is added only when traveling at speeds of

40\text{ mph}

or higher.

Combine the base time and speed modifier

5.5 + 0 = 5.5\text{ seconds}

Total minimum following interval equals the base vehicle length calculation under ideal conditions.

Anahtar Kavram

CDL safe following distance formula: 1 second per 10 feet of vehicle length under 40 mph, plus 1 extra second at 40 mph and above.

Tahmini Süre:45s

Soru

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Adım Adım Çözüm

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