Oklahoma CDL — General Knowledge practice
Oklahoma CDL — General Knowledge: Speed & Space Management practice test
Choosing a safe speed, keeping a space cushion, adjusting for weather and traffic, and understanding stopping distance.
Content reviewed against official driver handbooks · August 12, 2026
14 questions · pass with 11 correct. You get instant feedback and an explanation after every answer.
Study questions with answers
12 sample Speed & Space Management questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
Show all 12 questions with answers
1. On packed snow, by about how much should you cut your speed?
Correct answer: About one-half
On packed snow, reduce your speed by a half or more.
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
2. At speeds above 40 mph, how much should you add to your following distance?
Correct answer: One extra second
Add one extra second of following distance when you are traveling faster than 40 mph.
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
3. Total stopping distance is made up of which parts?
Correct answer: Perception distance, reaction distance, and braking distance
Total stopping distance combines perception distance, reaction distance, and braking distance.
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
4. Wet roads can change your stopping distance by about how much?
Correct answer: About double
Wet roads can roughly double your stopping distance, so you must slow down.
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
5. Of all the space around your vehicle, which is the most important to manage?
Correct answer: The space ahead of you
The space ahead — the area you are driving into — is the most important because you may need to stop suddenly.
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
6. Below 40 mph, what is the rule of thumb for following distance?
Correct answer: About one second per 10 feet of your vehicle's length
Under 40 mph, leave roughly one second of space for every 10 feet of your vehicle's length.
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
7. Compared with a loaded truck, an empty truck usually...
Correct answer: Needs a greater stopping distance because it has less traction
An empty truck has less traction, so it generally needs a greater stopping distance than a loaded one.
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
8. At 55 mph, the perception distance for an alert driver is about...
Correct answer: 142 feet
The average alert driver's perception distance at 55 mph is about 142 feet.
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
9. If you double your speed, your braking distance becomes about...
Correct answer: Four times as long
Doubling your speed makes the braking distance and the impact roughly four times greater.
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
10. On a wet road, by about how much should you reduce your speed?
Correct answer: About one-third
Cut your speed by about one-third on a wet road, for example from 55 to around 35 mph.
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
11. Hydroplaning can begin at speeds as low as...
Correct answer: 30 mph
With enough water on the road, hydroplaning can start at speeds as low as 30 mph.
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
12. On dry pavement at 55 mph with brakes in good shape, the braking distance alone is about...
Correct answer: 216 feet
Braking distance alone at 55 mph on dry pavement is roughly 216 feet.
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
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Every Oklahoma question is written from the official Oklahoma driver handbook and checked against its current edition. DMV Test Free is a free, independent study resource — not affiliated with any DMV or government agency. About DMV Test Free