Examkin

Soru

Zorluk: OrtaSpace Ahead and Following Distance

While traveling on an interstate highway at 50 mph50\text{ mph}, a professional driver operates a 30-foot30\text{-foot} delivery truck under clear, dry conditions. Based on standard CDL space management rules, what is the minimum safe following distance that must be maintained behind the lead vehicle?

  1. A
    3 seconds3\text{ seconds}
  2. B
    2 seconds2\text{ seconds}
  3. 4 seconds4\text{ seconds}Cevap
  4. D
    5 seconds5\text{ seconds}

Cevap

The minimum safe following distance is 4 seconds4\text{ seconds}.
For commercial vehicles, safe following distance is calculated as 1 second for every 10 feet of vehicle length, plus 1 additional second for speeds of 40 mph or greater. For a 30-foot truck traveling at 50 mph, the calculation is 3 seconds for length plus 1 second for speed, resulting in a total required following distance of 4 seconds.

Adım Adım Çözüm

1
Calculate the base following distance required for vehicle length.
30 feet10 feet/second=3 seconds\frac{30\text{ feet}}{10\text{ feet/second}} = 3\text{ seconds}
Commercial driver rules establish a base requirement of 1 second for every 10 feet of vehicle length.
2
Check vehicle speed and apply the high-speed modifier.
3 seconds+1 second=4 seconds3\text{ seconds} + 1\text{ second} = 4\text{ seconds}
When operating at speeds at or above 40 mph40\text{ mph}, driver safety standards require adding 1 additional second to the base following interval.

Anahtar Kavram

CDL safe following distance formula requires 1 second per 10 feet of vehicle length, plus 1 additional second for speeds at or above 40 mph.
Tahmini Süre:1m 0s
Bu soruyu puanla

Konular

Space Ahead and Following Distance

Bu konudan daha fazla soru