Safe DrivingQuestion 33 of 120
The same 40-foot vehicle is now traveling at 55 mph on dry pavement. What following distance should you keep?
a.4 seconds
b.3 seconds
c.5 seconds
d.2 seconds
Explanation
Above 40 mph you add one second to the length-based figure, so 4 seconds becomes 5 seconds. Keeping only 2, 3, or 4 seconds leaves too little room for the longer stopping distance at highway speed.
Practice all 120 questions free — no signup required.
Related questions on this topic
- You are traveling at 55 mph on dry pavement in a heavy vehicle. Roughly what total distance will you cover from the moment a hazard appears until you are stopped?
- If you double your speed from 20 mph to 40 mph, what happens to your braking distance?
- You are driving a 40-foot straight truck at 35 mph on a dry road. What is the minimum safe following distance?
- Rain has just begun after a long dry spell and the road surface is slick. How should you adjust your following distance and speed?
- You are approaching a curve posted at 40 mph while driving a loaded tractor-trailer. What is the safest approach?
- You are starting down a long, steep grade in a loaded truck. What is the correct braking technique?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against Commercial Driver's License (CDL) General Knowledge Test · How we review