307. When driving on grades, which of these is the best choice for a safe speed?
Detailed Explanation
The correct answer is "Based on your vehicle and its cargo, select a speed that is safe within the posted limit.". This question tests speed and following-distance decisions that preserve enough room to perceive, react, and stop. For a differently worded version of this question, identify the hazard first and then choose the answer that preserves control, visibility, or legal compliance.
Correct Answer: Based on your vehicle and its cargo, select a speed that is safe within the posted limit.
Why This Matters on the CDL Test
Use this as part of your General Knowledge review. The real CDL knowledge test rewards drivers who understand the reason behind each rule, not only the answer letter, so read the explanation and then try a few related questions.
How to Remember It
Say the rule in your own words, then explain why the wrong answers are unsafe or incomplete. That habit makes similar General Knowledge questions easier when the exam changes the wording.
Answer Review
Choose "Based on your vehicle and its cargo, select a speed that is safe within the posted limit." because this answer matches the safe CDL action for general knowledge knowledge. On the knowledge test, the safest answer is usually the one that protects space, control, visibility, legal compliance, or inspection accuracy before the vehicle is put at risk.
Why the other answers are weaker
- If you have a light load, you can go faster than those with a heavy load."If you have a light load, you can go faster than those with a heavy load." does not best answer this general knowledge knowledge question. When you see a similar option on the CDL permit test, compare it against the exact safety rule and choose the answer that prevents the most immediate risk.
- Follow the vehicle in front of you."Follow the vehicle in front of you." does not best answer this general knowledge knowledge question. When you see a similar option on the CDL permit test, compare it against the exact safety rule and choose the answer that prevents the most immediate risk.
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.
Ready to practice for real?
Take our free, full-length General Knowledge practice test. Simulates the actual DMV exam with timed questions.
Start Practice TestRelated Questions
196. You are driving a vehicle that could safely be driven at 55 mph on an open road; but traffic is now heavy, moving at 35 mph, although the speed limit is 55. The safest speed for your vehicle in this situation is most likely:
266. When you drive in the mountains, you will have to use lower gears to drive safely down grades. Which of these does NOT affect your choice of gears?
96. The distance that you should look ahead of your vehicle while driving amounts to about _____ at highway speed.
If you are driving at a reduced speed in a construction zone when you spot a construction worker near the road, you should:
When driving on a wet road, you should reduce your speed by:
Keep Studying General Knowledge
Question pages help you review one rule at a time. To build test-day speed, move back into the full General Knowledge practice test and answer a mixed set without looking at the explanation first.
State CDL Practice Paths
After you understand this answer, use a state practice path to connect the federal CDL rule with the DMV test pages drivers search for most.