A commercial driver is operating a 70\text{-foot} combination vehicle at a steady cruising… — Commercial Driver's License (CDL) General Knowledge Exam

A commercial driver is operating a $70\text{-foot}$ combination vehicle at a steady cruising speed of $45\text{ mph}$ on a dry, multi-lane bypass. Under standard commercial vehicle safety guidelines, what is the minimum safe following distance the driver must maintain?

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

Cevap

The minimum safe following distance is

8\text{ seconds}

For commercial vehicles, safe following distance is calculated as

1\text{ second}

for every

10\text{ feet}

of vehicle length when traveling under

40\text{ mph}

, plus

1\text{ additional second}

for speeds at or above

40\text{ mph}

. A

70\text{-foot}

vehicle requires a base buffer of

7\text{ seconds}

. Because the vehicle is traveling at

45\text{ mph}

(

40\text{ mph}

or higher),

1\text{ second}

is added, totaling

8\text{ seconds}

Adım Adım Çözüm

Determine the baseline time required based on vehicle length.

\frac{70\text{ feet}}{10\text{ feet per second}} = 7\text{ seconds}

The standard CDL formula requires

1\text{ second}

for each

10\text{ feet}

of vehicle length.

Apply the speed adjustment factor.

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

For travel speeds at or above

40\text{ mph}

, an additional

1\text{ second}

of following distance must be added.

Anahtar Kavram

Commercial vehicle following distance calculation using the 1-second-per-10-feet rule plus 1 second for speeds of 40 mph or greater.

Tahmini Süre:1m 0s

Soru

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Konular

Bu konudan daha fazla soru