A New York CDL driver is operating a 40-foot commercial vehicle above 40 mph. What following distance does the CDL-10 manual recommend at minimum?
Detailed Explanation
Use one second for each 10 feet of vehicle length, then add one second when traveling above 40 mph. A 40-foot vehicle therefore needs at least five seconds in normal conditions, with more space on slippery roads.
Official reference: New York CDL-10, Section 2.7.1: Space AheadCorrect Answer: 5 seconds
Why This Matters on the CDL Test
Use time rather than a fixed distance.
How to Remember It
Four plus one equals five.
Answer Review
Calculate 40 / 10 = 4 seconds, then add 1 for speed above 40 mph: 5 seconds.
Why the other answers are weaker
- 2 secondsThis is shorter than the calculated minimum.
- Exactly 40 feetVehicle length is the calculation input, not the following gap.
Test-Day Checklist
- Read the question once for the topic, then read it again for the exact CDL action being tested in General Knowledge.
- Eliminate answers that sound convenient but skip an inspection, warning sign, or safety step.
- Say the correct rule out loud before moving on so you can recognize it when the exam changes the wording.
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