Oklahoma CDL — General Knowledge practice
Speed & Space Management
Choosing a safe speed, keeping a space cushion, adjusting for weather and traffic, and understanding stopping distance.
Content reviewed against official driver handbooks · July 7, 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.
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