New Mexico CDL — General Knowledge: Speed & Space Management Practice Test

Question 1

Why does the manual say matching the speed of other vehicles is safest in heavy traffic?

Accepted Answer

Vehicles traveling the same way at one speed are unlikely to collide — When everyone moves together there is little closing speed between vehicles, so going with the flow, without driving at an illegal or unsafe speed, is safest.

Answer

Slower traffic has the right-of-way

Answer

Speed limits do not apply in heavy traffic

Answer

Matching speed shortens your stopping distance

Question 2

You are hauling less than a full load of livestock. What does the manual say to use to keep the animals bunched together?

Accepted Answer

False bulkheads — Livestock moving around makes a trailer handle unsafely, so a partial load is held in a group with false bulkheads.

Answer

Extra tie-down straps

Answer

Header boards

Answer

Tarps over the trailer sides

Question 3

Why do dry bulk tanks call for special care on curves and sharp turns?

Accepted Answer

The load sits high and is able to shift — A dry bulk tank is top-heavy and its contents can move, so the manual says to be slow and careful around curves and in sharp turns.

Answer

They are longer than other trailers

Answer

Their brakes are weaker than those on vans

Answer

They cannot carry placards

Question 4

On an upgrade, which conditions call for more use of lower gears?

Accepted Answer

A steeper grade, a longer grade, or a heavier load — Gravity slows you on any upgrade; a steeper or longer climb or a heavier load all push you into lower gears.

Answer

A wider road, a lighter load, or a tailwind

Answer

A newer truck, a shorter grade, or dry pavement

Answer

A lower posted speed limit or heavier traffic

Question 5

On a cold, wet-looking road you notice that other vehicles are throwing no spray. What does the manual say that indicates?

Accepted Answer

Ice has formed on the road — When checking for ice in winter, the absence of spray from other vehicles is a sign that the surface has frozen.

Answer

The road has dried completely

Answer

The pavement was recently resurfaced

Answer

The vehicles have new tires

Question 6

Cargo is loaded so that the driving axles carry too little weight. What problem does the manual describe?

Accepted Answer

Poor traction, with drive wheels that spin easily — Lightly loaded drive axles cannot grip well, so the wheels spin readily and in bad weather the truck may be unable to keep going.

Answer

Hard steering and damage to the steering axle

Answer

Overheated brake drums on the trailer

Answer

A higher chance of hydroplaning at low speed

Question 7

How does a heavier vehicle affect the work its brakes must do in a stop?

Accepted Answer

The brakes do more work and absorb more heat — More weight means more braking work and more heat. Even so, an empty truck needs more distance to stop, because it has less traction.

Answer

The brakes do less work, because weight adds traction

Answer

The brakes are unaffected; only the tires matter

Answer

The brakes cool faster under a heavy load

Question 8

On a flatbed, what added risk does the manual link to cargo whose center of gravity is high?

Accepted Answer

The load is more likely to slide sideways or come off — A high center of gravity raises rollover risk on any vehicle, and on flatbeds it also raises the chance that the load moves to one side or falls.

Answer

The load is more likely to slide forward under braking only

Answer

The tie-downs loosen faster in cold weather

Answer

The trailer's axle weights become illegal

Question 9

You enter a curve too fast and the tires lose their traction. What does the manual say happens?

Accepted Answer

The vehicle keeps going straight and skids off the road — Too much speed in a curve ends one of two ways: the tires lose traction and the vehicle slides straight on off the road, or they hold and the vehicle rolls over.

Answer

The vehicle rolls over toward the inside of the curve

Answer

The vehicle slows on its own until grip returns

Answer

The trailer brakes lock automatically

Question 10

What does the manual mean when it says overheated brakes may start to 'fade'?

Accepted Answer

It takes more and more pedal effort to get the same braking — Fade is the loss of stopping power as brakes get too hot; keep using them hard and they can fade until you cannot slow or stop.

Answer

The brake lights grow dim

Answer

The brake linings wear evenly

Answer

The pedal becomes firmer and more responsive

Question 11

What does the manual say happens to an overloaded truck on grades?

Accepted Answer

It must go very slowly uphill and may gain too much speed downhill — Overloading hurts steering, braking and speed control: upgrades become a crawl, downgrades can run away, stopping distance grows and brakes can fail.

Answer

It climbs faster but brakes better going down

Answer

It is unaffected as long as the tires are rated for the weight

Answer

It handles normally until the brakes are applied

Question 12

According to accident reports cited in the manual, which vehicle are trucks and buses most likely to hit?

Accepted Answer

The one directly in front of them — The space ahead matters most because the vehicle ahead is the one large vehicles strike most often, usually from following too closely.

Answer

A vehicle passing on the left

Answer

A vehicle merging from an on ramp

Answer

A parked vehicle on the shoulder

New Mexico CDL — General Knowledge: Speed & Space Management practice test

Study questions with answers

1. Why does the manual say matching the speed of other vehicles is safest in heavy traffic?

2. You are hauling less than a full load of livestock. What does the manual say to use to keep the animals bunched together?

3. Why do dry bulk tanks call for special care on curves and sharp turns?

4. On an upgrade, which conditions call for more use of lower gears?

5. On a cold, wet-looking road you notice that other vehicles are throwing no spray. What does the manual say that indicates?

6. Cargo is loaded so that the driving axles carry too little weight. What problem does the manual describe?

7. How does a heavier vehicle affect the work its brakes must do in a stop?

8. On a flatbed, what added risk does the manual link to cargo whose center of gravity is high?

9. You enter a curve too fast and the tires lose their traction. What does the manual say happens?

10. What does the manual mean when it says overheated brakes may start to 'fade'?

11. What does the manual say happens to an overloaded truck on grades?

12. According to accident reports cited in the manual, which vehicle are trucks and buses most likely to hit?

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