Texas CDL — General Knowledge practice
Texas 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
11 questions · pass with 9 correct. You get instant feedback and an explanation after every answer.
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11 sample Road Signs 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. A round sign with black markings on a yellow background stands beside the road just before a public railroad crossing. It tells you to:
Correct answer: Cut your speed, watch and listen for a train, and be ready to halt before the rails
The circular yellow advance warning sign is posted ahead of a public crossing. It is your cue to ease off the speed, watch and listen for a train, and be ready to halt short of the rails.
2. A speed limit sign posted on a freeway entrance or exit ramp:
Correct answer: May suit a car and still be too fast for a loaded rig
Ramp speeds are set with cars in mind. A figure that suits a passenger vehicle can still be far too quick for a tall, heavy rig, and a ramp that drops downhill while it curves is worse still.
3. A small plate mounted underneath a crossbuck at a railroad crossing tells a driver:
Correct answer: How many separate tracks the road crosses at that spot
Where a road crosses more than one line of track, a plate below the crossbuck states how many tracks are there. Knowing that matters, because a train on the near track can hide a second train behind it.
4. Signs placed at the top of a long mountain grade most often warn a commercial driver about:
Correct answer: How far the grade runs and how steeply it falls
Before a long descent, roadside signs tell you how far the grade runs and how sharply it drops. Those two facts, along with your weight and the weather, decide the speed you should pick.
5. A sign for a 'runaway truck ramp' tells drivers that:
Correct answer: There is an escape ramp ahead for vehicles that have lost their brakes
A runaway truck ramp is an escape ramp ahead where a vehicle that has lost its brakes can be brought to a safe stop. Note its location as you start down a long grade.
6. A sign showing a height such as '13 ft 6 in' warns commercial drivers of:
Correct answer: The greatest height that can safely pass under the structure ahead
This is a low-clearance sign giving the maximum height that can pass under a bridge or structure ahead. If your vehicle is taller, you must take another route.
7. The slow-moving vehicle emblem is required on equipment built to travel no faster than:
Correct answer: 25 mph
Texas requires the emblem on any vehicle designed to run at 25 miles per hour or less, which takes in farm and road machinery and anything drawn by animals or by a slow vehicle.
8. Vehicles hauling certain hazardous materials have to display warning signs shaped like:
Correct answer: A diamond, that is, a square standing on one of its points
Placards are squares tipped up to rest on one corner, giving the familiar diamond outline. They warn everyone nearby that a regulated hazardous load is aboard.
Source: Texas CDL Handbook — Hazardous Materials Rules for All Commercial Drivers
9. Coming down a grade you pass a sign reading "Maximum Safe Speed." What does it require of you?
Correct answer: Hold your speed at or below the figure shown on the sign
A maximum safe speed sign sets a ceiling you are not allowed to go past. Treat the number on it as the fastest you may travel on that grade, no matter what your rig weighs.
10. When the load limit on a farm- or ranch-to-market road is lowered, drivers find out because:
Correct answer: Signs go up along the road showing the limit now in force
The State Highway Commission may reduce the load limit on farm and ranch roads. When it does, signs go up along that road stating the limit now in force.
Source: Texas CDL Handbook — Exceptions to Standard Vehicle Size Requirements
11. Some public crossings are marked with signs telling drivers that trains do not blow a horn there. The lesson for a commercial driver is:
Correct answer: Silence proves nothing, so look for the train yourself
Trains are sometimes barred from sounding a horn at a crossing, and signs identify those places. Never treat silence as proof the track is clear, especially since cab noise can bury a horn until a train is almost on top of you.
Source: Texas CDL Handbook — Railroad-Highway Crossing Procedures
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