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Difficulty: EasySpace Ahead and Following Distance

Under ideal weather and dry road conditions, how many seconds of following distance should a commercial driver maintain when operating a 60-foot60\text{-foot} vehicle at a steady speed of 35 mph35\text{ mph}?

  1. A
    7 seconds7\text{ seconds}
  2. 6 seconds6\text{ seconds}Answer
  3. C
    3 seconds3\text{ seconds}
  4. D
    5 seconds5\text{ seconds}

Answer

6 seconds6\text{ seconds}
According to the CDL manual, drivers must maintain at least 1 second for each 10 feet of vehicle length at speeds under 40 mph. For a 60-foot vehicle traveling at 35 mph, 60 divided by 10 equals 6 seconds of required space ahead.

Step-by-Step Solution

1
Calculate base following distance based on vehicle length.
60 ft/10 ft per second=6 seconds60\text{ ft} / 10\text{ ft per second} = 6\text{ seconds}
The standard rule specifies 1 second for each 10 feet of vehicle length.
2
Determine if additional time is needed for vehicle speed.
No additional seconds added (0 seconds0\text{ seconds}).
The speed is 35 mph35\text{ mph}, which is below the 40 mph40\text{ mph} threshold that requires adding an extra second.
3
Compute total required following distance.
6 seconds+0 seconds=6 seconds6\text{ seconds} + 0\text{ seconds} = 6\text{ seconds}
Combining base length seconds and speed adjustment yields the final required buffer.

Key Concept

CDL Following Distance Formula
Estimated Time:45s
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Topics

Space Ahead and Following Distance

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