Montana CDL — General Knowledge practice
Montana 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.
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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.
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1. The temperature is near 32 degrees Fahrenheit and dropping. Which surface does the manual say freezes before the rest of the road?
Correct answer: Bridges
Among its signs of slippery roads, the manual says bridges freeze before the road does when the temperature drops, and calls for special care near 32 degrees Fahrenheit.
Source: Montana Commercial Driver License Manual — Section 2.6.2, Matching Speed to the Road Surface
2. Which clues on the road surface does the manual say point to standing water that could cause hydroplaning?
Correct answer: Clear reflections, splashing from tires and raindrops on the surface
The manual tells drivers to watch for clear reflections, splashes from tires and raindrops on the road as indications that water is standing there.
Source: Montana Commercial Driver License Manual — Section 2.6.2, Matching Speed to the Road Surface
3. When you are driving in heavy traffic, what does the manual call the safest speed?
Correct answer: The speed of the other vehicles
Vehicles headed the same way at matching speeds are unlikely to run into each other, so the manual says to go with the flow as long as that speed is legal and safe.
Source: Montana Commercial Driver License Manual — Section 2.6.5, Speed and Traffic Flow
4. In roadway work zones, what does the manual name as the leading cause of deaths and injuries?
Correct answer: Speeding traffic
The manual identifies speeding traffic as the leading cause of injury and death in work zones and tells drivers not to let their speed creep up through long sections of construction.
Source: Montana Commercial Driver License Manual — Section 2.6.7, Roadway Work Zones
5. A road tilts enough that the top of your vehicle could strike signs or trees along the edge. What does the manual suggest?
Correct answer: Move slightly nearer the middle of the road
Where a tilted road makes it hard to clear objects along the edge, the manual says to move a bit nearer the center of the road.
Source: Montana Commercial Driver License Manual — Section 2.7.4, Space Overhead
6. What does the manual warn about drainage channels that run across a road?
Correct answer: They can make the ends of some vehicles drag, so cross them carefully
The space under a heavily loaded vehicle can be very small. The manual says such channels can make the ends of some vehicles scrape, and should be crossed with care.
Source: Montana Commercial Driver License Manual — Section 2.7.5, Space Below
7. Why might the driver of a modern truck need a lower gear going down a hill than the gear used to climb it?
Correct answer: Low-friction parts and streamlined shapes leave less friction and air drag to hold the truck back
Newer trucks have low-friction parts, streamlined shapes and often more powerful engines, so they climb in higher gears and have less drag holding them back on the way down.
Source: Montana Commercial Driver License Manual — Section 2.16.2, Select the Right Gear before Starting Down the Grade
8. You cleared a low bridge on the way out with a loaded cargo van. Why might the empty van not clear it on the way back?
Correct answer: An empty van rides higher than a loaded one
The weight of the cargo changes a van's height. The manual warns that getting under a bridge loaded does not mean you can do it empty.
Source: Montana Commercial Driver License Manual — Section 2.7.4, Space Overhead
9. What easy check for ice does the manual describe that you can make from the driver's seat?
Correct answer: Roll the window down and touch the front of the mirror, its support or the antenna
If ice is forming on the mirror, its support or the antenna, the manual says the road surface is probably beginning to ice up as well.
Source: Montana Commercial Driver License Manual — Section 2.6.2, Matching Speed to the Road Surface
10. With a lot of water on the road, hydroplaning can happen at speeds as low as what?
Correct answer: 30 mph
The manual says it does not take much water to cause hydroplaning, which can occur at 30 mph when there is a lot of water, and is more likely with low tire pressure or worn tread.
Source: Montana Commercial Driver License Manual — Section 2.6.2, Matching Speed to the Road Surface
11. Why is the road very slippery right after rain begins?
Correct answer: The water mixes with oil that vehicles have left on the road
The manual explains that early rain mixes with oil on the roadway and makes it very slippery, and that continued rain washes the oil away.
Source: Montana Commercial Driver License Manual — Section 2.6.2, Matching Speed to the Road Surface
12. On a downgrade, when is the braking effect of the engine greatest?
Correct answer: With the engine close to governed rpm and the transmission in one of the lower gears
The manual says the engine must be the main way of controlling speed on downgrades, and that its braking effect peaks near governed rpm in the lower gears.
Source: Montana Commercial Driver License Manual — Section 2.6.6, Speed on Downgrades
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