A professional driver is operating a 20-foot straight delivery truck at 25\text{ mph} in c… — Commercial Driver's License (CDL) General Knowledge Exam

A professional driver is operating a $20$ -foot straight delivery truck at $25\text{ mph}$ in clear weather on a dry downtown street. According to commercial driving safety standards, what is the minimum safe following distance the driver should maintain behind the vehicle ahead?

A
$1\text{ second}$
$2\text{ seconds}$ Cevap
C
$3\text{ seconds}$
D
$4\text{ seconds}$

Cevap

2\text{ seconds}

Under normal driving conditions at speeds below

40\text{ mph}

, the standard CDL following distance formula requires

1\text{ second}

for every

10\text{ feet}

of vehicle length. For a

20

-foot straight truck traveling at

25\text{ mph}

, the required safe interval is

20 / 10 = 2\text{ seconds}

Adım Adım Çözüm

Apply the baseline commercial vehicle following distance formula: allow

1\text{ second}

for each

10\text{ feet}

of vehicle length.

\frac{20\text{ feet}}{10\text{ feet}} = 2\text{ seconds}

This establishes the base time cushion needed to perceive hazards and begin braking.

Check whether the operating speed requires the high-speed safety adjustment.

The truck is traveling at

25\text{ mph}

, which is below

40\text{ mph}

, so no extra second is added.

An additional

1\text{ second}

is only required when driving at speeds of

40\text{ mph}

or above.

Anahtar Kavram

Calculating safe following distance using the 1 second per 10 feet rule for speeds below 40 mph

Tahmini Süre:45s

Soru

Cevap

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