A commercial driver is operating a 70-foot double trailer combination unit at a cruising s… — Commercial Driver's License (CDL) General Knowledge Exam

A commercial driver is operating a $70$ -foot double trailer combination unit at a cruising speed of $50\text{ mph}$ on a clear, dry interstate highway. Under standard commercial vehicle space management formulas, what is the minimum following distance, in seconds, that the driver must maintain behind the preceding vehicle?

A
$7\text{ seconds}$
B
$4\text{ seconds}$
$8\text{ seconds}$ Cevap
D
$6\text{ seconds}$

Cevap

The minimum safe following distance required is

8\text{ seconds}

Under standard CDL space management guidelines, drivers must maintain at least

1\text{ second}

for every

10\text{ feet}

of vehicle length when traveling under

40\text{ mph}

, plus an additional

1\text{ second}

for speeds at or above

40\text{ mph}

. For a

70

-foot combination traveling at

50\text{ mph}

, the calculation is

(70 \div 10) + 1 = 8\text{ seconds}

Adım Adım Çözüm

Calculate the base following distance interval based on total vehicle length.

70\text{ ft} \div 10\text{ ft/sec} = 7\text{ seconds}

The commercial driving baseline rule requires at least

1\text{ second}

of following distance for every

10\text{ feet}

of vehicle length at speeds under

40\text{ mph}

Evaluate the vehicle operating speed and determine if a speed adjustment factor is required.

Since the operating speed is

50\text{ mph}

(which is

\ge 40\text{ mph}

), add

1\text{ additional second}

At speeds at or above

40\text{ mph}

, higher braking energy and increased stopping distance necessitate an extra second of space cushion.

Sum the base length interval and the speed modifier.

7\text{ seconds} + 1\text{ second} = 8\text{ seconds}

The total minimum safe following distance under ideal driving conditions equals the sum of the base time cushion and the high-speed modifier.

Anahtar Kavram

Calculating Commercial Vehicle Space Ahead and Following Distance

Tahmini Süre:1m 15s

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