According to commercial driver space management guidelines, an articulated vehicle measuri… — Commercial Driver's License (CDL) General Knowledge Exam

According to commercial driver space management guidelines, an articulated vehicle measuring $60\text{ feet}$ in total length traveling at $48\text{ mph}$ on a dry roadway maintains an adequate safety cushion when following a lead car at an interval of $6\text{ seconds}$ .

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False

The statement is false because a

60\text{-foot}

vehicle traveling at

48\text{ mph}

requires a minimum following distance of

7\text{ seconds}

(

6\text{ seconds}

for length plus

1\text{ second}

for exceeding

40\text{ mph}

), meaning

6\text{ seconds}

is insufficient.

Adım Adım Çözüm

Calculate the base following distance based on vehicle length.

60\text{ feet} \div 10\text{ feet/second} = 6\text{ seconds}

The baseline CDL rule requires at least

1\text{ second}

for each

10\text{ feet}

of vehicle length.

Check the operating speed against the

40\text{ mph}

adjustment threshold.

48\text{ mph} \ge 40\text{ mph}

Speeds of

40\text{ mph}

and higher require an additional time buffer due to longer braking distances.

Add the high-speed safety adjustment to determine the total required following distance.

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

Adding the

1\text{ additional second}

yields the minimum safe following interval of

7\text{ seconds}

, which is greater than the

6\text{ seconds}

stated.

Anahtar Kavram

CDL Following Distance Rule: 1 second per 10 feet of vehicle length under 40 mph, plus 1 additional second for speeds at or above 40 mph.

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