Under ideal, dry road conditions, a commercial driver operating a 35\text{-foot} vehicle a… — Commercial Driver's License (CDL) General Knowledge Exam

Under ideal, dry road conditions, a commercial driver operating a $35\text{-foot}$ vehicle at a steady cruising speed of $45\text{ mph}$ satisfies standard commercial following distance requirements by maintaining a safety gap of $3.5\text{ seconds}$ behind the vehicle ahead.

Cevap: Cevap

Cevap

False (The required minimum following distance is

4.5\text{ seconds}

, not

3.5\text{ seconds}

The statement is false because the standard CDL following distance rule requires

1\text{ second}

for each

10\text{ feet}

of vehicle length plus an additional

1\text{ second}

for speeds at or above

40\text{ mph}

. At

45\text{ mph}

, a

35\text{-foot}

vehicle requires

3.5 + 1.0 = 4.5\text{ seconds}

of following distance.

Adım Adım Çözüm

Calculate the baseline time gap required for vehicle length under the standard CDL formula.

\frac{35\text{ feet}}{10\text{ feet/second}} = 3.5\text{ seconds}

Commercial vehicle guidelines allocate

1\text{ second}

of headway for every

10\text{ feet}

of overall vehicle length.

Evaluate operating speed against the commercial speed-threshold rule.

Speed is

45\text{ mph}

, which meets and exceeds the

40\text{ mph}

threshold, requiring

+1.0\text{ second}

At speeds of

40\text{ mph}

and above, stopping distance increases significantly, requiring an additional

1\text{ second}

safety cushion.

Sum the baseline length interval and the high-speed safety buffer.

3.5\text{ seconds} + 1.0\text{ second} = 4.5\text{ seconds}

The total required following distance under ideal conditions is

4.5\text{ seconds}

, making the proposed

3.5\text{-second}

gap insufficient.

Anahtar Kavram

CDL space ahead formula: 1 second per 10 feet of vehicle length under 40 mph, plus 1 additional second for speeds at or above 40 mph.

Tahmini Süre:45s

Soru

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Konular

Bu konudan daha fazla soru