Speed Limits & Following Distance — South Carolina
South Carolina CDL practice test: 447 free practice questions (Based on the official driver handbook). The official format is not yet verified; check the official site before your test. Speed Limits & Following Distance: 14 questions.
Posted speed limits, school and construction zones, stopping and following distance.
This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines.
| Topic / Metric | Value |
|---|---|
| Topic | Speed Limits & Following Distance |
| License test | South Carolina CDL permit (CLP) knowledge tests |
| Topic questions | 14 (3% of 447 total) |
| Review status | This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines. |
Official handbook
Not yet verified
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Questions (14)
1. Stopping distance can be affected by:
- Speed. ✓
- Sunshine.
- Time of day.
- Traffic.
Answer: A. Speed.
Speed affects stopping distance: the faster you drive, the longer the braking distance becomes. The handbook's stopping-distance section says that when speed goes up, braking distance grows, and it gives the example that doubling speed makes braking distance four times longer. It also says slowing down reduces braking distance. The stopping-distance formula adds perception, reaction, and braking distance, so the speed-related braking part is a direct factor. The handbook does not present sunshine or time of day as factors in stopping distance.
2. When traveling at speeds under 40 mph, you should maintain at least ____ of following distance for every 10 feet of your vehicle's length.
- One second ✓
- Two seconds
- Three seconds
Answer: A. One second
At speeds under 40 mph, keep at least one second of following distance for every 10 feet of your vehicle's length. The handbook's space-ahead rule says that at speeds below 40 mph you need at least one second for each 10 feet of vehicle length. It gives the example of a 40-foot vehicle needing 4 seconds, and a 60-foot rig needing 6 seconds. Only when you go above 40 mph do you add another second. So the minimum at lower speeds is one second per 10 feet, not two or three.
3. A sign indicating a maximum safe speed:
- Is suggesting a driving speed, but vehicles may travel faster than the posted speed.
- Is suggesting a speed limit to be followed only by vehicles weighing more than 26,000 pounds.
- Should be followed and no vehicle should travel faster than the posted speed. ✓
- Is only applicable to automobiles.
Answer: C. Should be followed and no vehicle should travel faster than the posted speed.
A sign indicating a maximum safe speed should be followed, and no vehicle should travel faster than the posted speed. The handbook says that when there is a sign indicating "Maximum Safe Speed," you should never exceed the speed shown. It treats that sign as a speed you must stay at or below, not as a casual suggestion. So the safe and proper action is to follow the posted maximum safe speed and not go faster than it.
4. What is a bobtail tractor?
- A tractor without a semi-trailer ✓
- A tractor with two semi-trailers
- A tractor that travels faster than the speed limit
Answer: A. A tractor without a semi-trailer
A bobtail tractor is a tractor without a semi-trailer. The handbook uses the term bobtail for a tractor that is running without a semi-trailer attached. It also warns that these tractors can be hard to stop smoothly and may take longer to stop than a fully loaded tractor-semitrailer. That description matches a tractor with no trailer, not a tractor pulling one or two trailers.
5. If you are being tailgated, you should:
- Drive on the shoulder.
- Pull off the roadway.
- Drive faster.
- Allow the vehicle to pass. ✓
Answer: D. Allow the vehicle to pass.
If you are being tailgated, allow the vehicle to pass by holding a steady, low speed and leaving extra room in front of you so the tailgater can get around. The handbook lists specific responses for a tailgater: avoid quick changes by signaling early and slowing gradually, open up your following distance, and do not speed up. It notes that extra room ahead both reduces your need for sudden moves and makes it easier for the tailgater to get past you. So the goal is not to escape the tailgater but to make passing them easy and predictable. The handbook also warns against tricks like flashing brake lights or turning on taillights.
6. Doubles combinations:
- Are less likely to jackknife than singles.
- Are less likely to roll over than singles.
- Require a larger reaction time than singles. ✓
Answer: C. Require a larger reaction time than singles.
7. While operating on a downgrade, you should brake until you reach a speed that is:
- 5 mph below your safe speed. ✓
- 10 mph below your safe speed.
- 15 mph below your safe speed.
Answer: A. 5 mph below your safe speed.
Brake until you are about 5 mph below your safe speed, then release the brakes. The handbook describes the braking technique for a long or steep downgrade. With the vehicle in the proper low gear, the engine does most of the slowing and the brakes are only a supplement. You apply the brakes enough to cause a clear slowdown, then release them once your speed is roughly five mph under your safe speed. When speed rises back to the safe speed, you repeat the process. That makes five mph below safe speed the release point.
8. When driving on the expressway during the skills test, you should:
- Switch lanes frequently.
- Use your mirrors to check traffic as needed. ✓
- Drive on the left side of the lane.
- Drive above the posted speed limit.
Answer: B. Use your mirrors to check traffic as needed.
You should use your mirrors to check traffic as needed while driving on the expressway during the skills test. The handbook's expressway instructions tell you to check traffic and your mirrors thoroughly in all directions when you resume, and its general driving section calls for regular mirror checks to stay aware of traffic around you. That makes mirror use the expected habit during the on-road test. The same expressway section also says to merge smoothly and keep your vehicle centered in the proper lane, so the test is not asking you to wander in the lane or change lanes for no reason.
9. When driving:
- You should always drive at the posted speed limit.
- You should always drive slightly below the posted speed limit.
- You should adjust your speed according to conditions. ✓
- You should drive as fast as possible.
Answer: C. You should adjust your speed according to conditions.
You should adjust your speed according to conditions, not simply hold to the posted limit. The handbook says driving too fast is a major cause of fatal crashes, and it tells you to adjust your speed to conditions such as traction, curves, visibility, traffic, and hills. It also says most serious skids come from driving too fast for road conditions, and that drivers who adjust their driving avoid too much acceleration and avoid having to over-brake or oversteer. That is why the correct approach is to set speed by what the road and traffic are doing, not to treat the posted limit as a fixed target.
10. If a speed limit is posted, the posted speed:
- Should never be exceeded. ✓
- May be exceeded if passing another vehicle.
- May be exceeded if driving in a rural area.
Answer: A. Should never be exceeded.
When a speed limit is posted, you should never exceed it. The handbook states plainly that if a speed limit is posted, or a sign shows a "Maximum Safe Speed," you must never go faster than the speed shown. The same section tells you to watch your speedometer so your speed does not creep up through long work zones, and to slow further for bad weather or road conditions. So the posted number is a ceiling you stay under, not a target to beat when it suits you.
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Last checked: 2026-10-17 · Not yet verified
Updated: · Based on the official driver handbook