Driving SafelyQuestion 52 of 60
At 50 mph in a 60-foot combination vehicle, about how many seconds of following distance should you keep?
a.1 second
b.2 seconds
c.3 seconds
d.At least 7 seconds (6 for length plus 1 for speed over 40 mph)
Explanation
Using the rule of 1 second per 10 feet of length, a 60-foot vehicle needs 6 seconds, and you add 1 second for speeds over 40 mph, for a total of about 7 seconds. This extra space accounts for the vehicle's long stopping distance. In bad weather or on hills you should allow even more.
Practice all 60 questions free — no signup required.
Related questions on this topic
- What causes a trailer to swing out and jackknife (trailer skid)?
- If your trailer begins to swing out in a jackknife, what should you generally do?
- Why do combination vehicles need a longer following distance than smaller vehicles?
- Why are combination vehicles more likely to roll over than they might appear?
- When driving a combination vehicle on a curved highway exit ramp, what should you do?
- How does the trailer respond to steering inputs compared to the tractor, and why does this matter?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against CDL Combination Vehicles Knowledge Test · How we review