Alabama CDL — General Knowledge practice
Alabama CDL — General Knowledge: Road Signs practice test
Learn the shapes, colors, and meanings of regulatory, warning, and guide signs — from stop and yield to construction and school-zone signs.
Content reviewed against official driver handbooks · August 12, 2026
13 questions · pass with 10 correct. You get instant feedback and an explanation after every answer.
Study questions with answers
12 sample Road Signs 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. A sign below the cross-buck at a crossing that reads a number tells you:
Correct answer: How many tracks the crossing has
When more than one track is present, a small sign under the cross-buck shows the number of tracks to expect.
Source: Alabama CDL Manual - Section 2.15.2 (Warning Signs and Devices)
2. A round yellow railroad advance warning sign means:
Correct answer: A railroad crossing is ahead; slow down and be ready to stop
The round advance warning sign tells you a crossing is coming so you can slow, look, and prepare to stop if needed.
Source: Alabama CDL Manual - Section 2.15.2 (Warning Signs and Devices)
3. The slow-moving vehicle emblem is described as:
Correct answer: A red triangle with an orange center
Farm and construction equipment often display a red triangle with an orange center to warn of their low speed.
Source: Alabama CDL Manual - Section 2.8.3 (Drivers Who Are Hazards)
4. A cross-buck is the sign shaped like:
Correct answer: A large white X marking a railroad crossing
The X-shaped cross-buck identifies a railroad crossing and requires drivers to yield to trains.
Source: Alabama CDL Manual - Section 2.15.2 (Warning Signs and Devices)
5. Warning signs that alert drivers to reduced speed limits and lane closures ahead are typical of:
Correct answer: Roadway work zones
Work zones are marked with signs warning of lower limits and changed conditions; speeding through them is the top cause of deaths there.
Source: Alabama CDL Manual - Section 2.6.7 (Roadway Work Zones)
6. On a two-lane road, what additional sign is posted at a railroad crossing besides the crossing markings?
Correct answer: A sign establishing a zone where passing is prohibited
Where only one lane runs each way, the approach to a grade crossing is signed as a zone where overtaking is banned, which matches the solid stripe painted alongside the X and letters on the surface.
Source: Alabama CDL Manual - Section 2.15.2 (Warning Signs and Devices)
7. Why should a driver treat the height figure posted at an overpass with caution?
Correct answer: Resurfacing work or hard-packed snow can leave less room than the plate shows
A clearance plate can fall out of date. Fresh layers of asphalt, or snow packed hard onto the roadway, lift the surface and leave a lower opening than the number on the sign promises.
8. Reflective triangles carried in a commercial vehicle are used to:
Correct answer: Warn approaching traffic when the vehicle is stopped on or near the road
The three reflective triangles are emergency warning devices placed on the road to alert others to your stopped vehicle.
Source: Alabama CDL Manual - Section 2.1 (Vehicle Inspection - Emergency Equipment)
9. The large 'X' with the letters RR painted on the pavement before a crossing is:
Correct answer: A pavement marking warning of the railroad crossing ahead
Pavement markings including an X and RR alert drivers to a rail crossing ahead, reinforcing the advance warning sign.
Source: Alabama CDL Manual - Section 2.15.2 (Warning Signs and Devices)
10. Signs posted on a steep mountain grade often point out the location of:
Correct answer: Escape ramps for runaway vehicles
Escape-ramp signs show drivers where runaway ramps are located so they can plan for a possible brake failure.
Source: Alabama CDL Manual - Section 2.16.3 (Brake Fading or Failure)
11. You start down a mountain grade and pass a sign giving a maximum safe speed. That number should be treated as:
Correct answer: A figure you must never go above
Where a hill carries a posted limit or a safe-speed plate, the figure shown is a ceiling you stay under, and the boards that describe how long and how steep the descent is deserve the same attention.
Source: Alabama CDL Manual - Section 2.16.1 (Select a Safe Speed)
12. An over-width or over-length load may be escorted by pilot vehicles, which normally display:
Correct answer: Warning boards and flashing lamps that alert other traffic
Permits for outsized freight often call for flags, oversize-load lettering and lamps on the truck itself, and the escorting cars carry their own boards and flashing lamps so approaching traffic is alerted well before the load arrives.
Source: Alabama CDL Manual - Section 3.4.4 (Oversized Loads)
More CDL — General Knowledge topics
Practice Road Signs in another state
Every Alabama question is written from the official Alabama 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