Sharing the Road — Iowa
Iowa CDL practice test: 408 free practice questions (Based on the official driver handbook). The official format is not yet verified; check the official site before your test. Sharing the Road: 23 questions.
Pedestrians, cyclists, school buses, emergency vehicles and heavy trucks.
This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines.
| Topic / Metric | Value |
|---|---|
| Topic | Sharing the Road |
| License test | Iowa CDL permit (CLP) knowledge tests |
| Topic questions | 23 (6% of 408 total) |
| Review status | This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines. |
Official handbook
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Questions (23)
1. A truck tractor built after March 1, 1997 must be equipped with:
- An Anti-Lock Braking System (ABS). ✓
- A flag.
- Hydraulic brakes.
Answer: A. An Anti-Lock Braking System (ABS).
A truck tractor built after March 1, 1997 must have an Anti-Lock Braking System (ABS). The handbook lists ABS as required equipment for truck tractors with air brakes built on or after March 1, 1997. It explains that ABS uses sensors and an electronic control unit to reduce brake pressure when a wheel is about to lock, so the wheels keep turning and the driver keeps more control during hard braking. The rule is tied to the manufacture date, so a tractor falling after that date needs the system. The handbook also notes that ABS is an addition to normal brakes and does not replace them.
2. If approaching a railroad crossing that is being approached by a train, you should:
- Try to cross the tracks quickly.
- Drive around any lowered gates.
- Stop and wait for the train to pass before beginning across the tracks. ✓
Answer: C. Stop and wait for the train to pass before beginning across the tracks.
Stop and wait for the train to pass before you begin crossing the tracks. The handbook says flashing red lights and bells at a crossing mean a train is approaching, and you must stop and yield the right of way. It tells you to remain stopped until the gates go up and the lights stop flashing, then proceed only when it is safe. It also warns against driving around a gate that stays down. Waiting keeps you from starting across while the train is still coming.
3. Using a helper when backing up a large vehicle is:
- Encouraged. ✓
- Discouraged.
- Illegal.
Answer: A. Encouraged.
Using a helper when backing a large vehicle is encouraged. The handbook says to use a helper whenever you can. It explains that large vehicles have blind spots you cannot see, which is why a helper matters. The helper should stand near the back where you can see them, and before you start backing you should agree on hand signals, including a signal for stop. That guidance treats a helper as a safety practice to use, not something to avoid or something prohibited.
4. What should you do if your vehicle gets stuck on railroad tracks?
- Stay in the vehicle.
- Get out of the vehicle and call for assistance. ✓
- Continue trying to get your vehicle off the tracks until you are successful.
Answer: B. Get out of the vehicle and call for assistance.
If your vehicle gets stuck on the tracks, get out of the vehicle and call for assistance. The handbook says that if you get stuck on the tracks for any reason, you should get out of the vehicle and away from the tracks. Then you check the signposts or signal housing at the crossing for emergency notification information and call 911 or another emergency number, giving the location with all identifiable landmarks, especially the DOT number if it is posted. So the right move is to leave the vehicle and phone for help, not to sit inside it or keep working the controls.
5. If a school bus needs to be evacuated, passengers should :
- Always exit through the rear door.
- Use the exit deemed safest. ✓
- Always exit through the front door.
Answer: B. Use the exit deemed safest.
6. A commercial motor vehicle driver:
- May use any cell phone while driving.
- May only use a hands-free cell phone while driving, if permitted. ✓
- May only use a cell phone while driving on rural roads.
Answer: B. May only use a hands-free cell phone while driving, if permitted.
A CMV driver may use only a hands-free mobile phone while driving, where use is permitted, and it must be kept close and operable while restrained by the seat belt. The handbook section on cell phones says federal rules restrict hand-held mobile telephone use by CMV drivers, and carriers may not require or allow it. If you choose to use a phone while operating a CMV, the handbook states you may only use a hands-free phone located close to you that you can operate in line with the rule for a voice communication. Using a hand-held phone covers holding it to talk, pressing more than one button to dial, or leaving the seated position to reach it. So the lawful choice is the hands-free phone, not just any phone.
7. Dry bulk tanks:
- Usually have low centers of gravity.
- Usually have high centers of gravity. ✓
- Are usually not allowed to cross railroad tracks.
Answer: B. Usually have high centers of gravity.
Dry bulk tanks usually have high centers of gravity. The handbook's cargo section directly describes dry bulk tanks as needing special care because they have a high center of gravity and the load can shift. That means the weight is carried high, making the vehicle less stable. The same passage tells you to be very cautious, slowing down for curves and sharp turns. The tank vehicle section also explains that a high center of gravity makes a vehicle top-heavy and easier to roll over, which fits the warning given for dry bulk tanks.
8. When approaching a railroad crossing, you should:
- Rely on warning signals to indicate if a train is approaching.
- Rely on the actions of other motorists to indicate if a train is approaching.
- Not rely solely on warning signals to indicate if a train is approaching. ✓
Answer: C. Not rely solely on warning signals to indicate if a train is approaching.
You should not rely solely on warning signals, gates, or flagmen to tell you a train is approaching. The handbook warns that warning signals, gates, and flagmen are not enough by themselves. Trains may not sound horns at some crossings, and noise inside your vehicle can keep you from hearing a horn until the train is close. A train on one track can also hide a train on another track. So you need to look and listen for yourself and check both directions before crossing, rather than trusting only the signals.
9. During the driving test, when encountering a railroad crossing, you should:
- Pass another vehicle on the tracks if the other vehicle is going too slow.
- Get out of the vehicle to check for a train.
- Not change gears while your vehicle is on the tracks. ✓
Answer: C. Not change gears while your vehicle is on the tracks.
You should not change gears while any part of your vehicle is on the tracks. The handbook says that before the crossing you should decelerate, brake smoothly, and shift gears as needed, but once any part of the vehicle is in the crossing you must not stop, change gears, pass another vehicle, or change lanes. Gears are set before you reach the tracks so you can keep both hands on the wheel and drive straight across without interruption. The school bus section repeats the same idea: cross in a low gear and do not shift while crossing.
10. When properly adjusted, the flat mirrors on a school bus should display:
- The sides of the school bus. ✓
- The ground under the school bus.
- The front tires touching the ground.
Answer: A. The sides of the school bus.
When properly adjusted, the flat side mirrors on a school bus should show the sides of the bus, among other things. The handbook's mirror adjustment section lists what a properly set outside left and right flat mirror lets you see: the area 200 feet or four bus lengths behind the bus, along the sides of the bus, and the rear tires touching the ground. Showing the sides of the bus is part of that list, which is why the answer naming the sides of the school bus fits. The same section points out that these mirrors are mounted at the front corners and are used to watch traffic, check clearances, and keep an eye on students beside and behind the bus.
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Last checked: 2026-10-17 · Not yet verified
Updated: · Based on the official driver handbook