Floods — Texas Permit Test
Floods on the Texas permit test — 7 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Six inches of water will reach the bottom of most passenger cars, causing loss of control and possible stalling.
Half a foot looks like nothing from the driver's seat. It is enough to lift the car off the road surface.
These are the facts: • Six inches of water will reach the bottom of most passenger cars, causing loss of control and possible stalling
Twelve inches of water will float many cars.
A floating car steers nothing and goes where the water goes. One foot is where that starts.
These are the facts: • Six inches of water will reach the bottom of most passenger cars, causing loss of control and possible stalling. • Twelve inches of water will float many cars
Two feet of rushing water will carry away pick-up trucks, sport utility vehicles, and most other vehicles.
Size and weight stop helping at this point. A truck goes the same way a car does.
These are the facts: • Six inches of water will reach the bottom of most passenger cars, causing loss of control and possible stalling. • Twelve inches of water will float many cars. • Two feet of rushing water will carry away pick-up trucks, SUVs, and most other vehicles
Nearly half of all flash flood deaths are vehicle-related.
People die in cars rather than on foot in a flood. That is what makes it a driving rule rather than a weather one.
Nearly half of all flash flood fatalities are vehicle-related
Water across a road may hide a missing segment of roadbed or a missing bridge.
The surface of the water tells you nothing about what is under it. There may be no road there at all.
These are the facts: • Six inches of water will reach the bottom of most passenger cars, causing loss of control and possible stalling. • Twelve inches of water will float many cars. • Two feet of rushing water will carry away pick-up trucks, SUVs, and most other vehicles. • Water across a road may hide a missing segment of roadbed or a missing bridge
Roads weaken under floodwater, so drivers should proceed cautiously after the water has receded because the road may collapse under the weight of a vehicle.
The danger does not leave with the water. What is left looks like a road and may not hold one.
These are the facts: • Six inches of water will reach the bottom of most passenger cars, causing loss of control and possible stalling. • Twelve inches of water will float many cars. • Two feet of rushing water will carry away pick-up trucks, SUVs, and most other vehicles. • Water across a road may hide a missing segment of roadbed or a missing bridge. Roads weaken under floodwater and drivers should proceed cautiously after waters have receded since the road may collapse under the vehicle’s weight
If a vehicle stalls in floodwater a driver should get out quickly and move to higher ground.
The water is still rising and the car is going nowhere. Staying with it is the mistake that kills people.
officials say if your vehicle stalls in floodwater, get out quickly and move to higher ground
On the test
How much water reaches the bottom of most passenger cars?
Six inches. Half a foot looks like nothing from the driver's seat. It is enough to lift the car off the road surface. Texas Driver Handbook, p.50: “These are the facts: • Six inches of water will reach the bottom of most passenger cars, causing loss of control and possible stalling”
How this works
Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.
You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.
Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.
What it costs
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Where these come from
Every rule here is checked against Texas Driver Handbook, published by the Texas Department of Public Safety, and against the state code itself. Last checked 2026-09-16.
- src/assets/drivers-manuals/TX.pdf (Texas Driver Handbook, form DL-7, Revised January 2026, Texas Department of Public Safety, retrieved 2026-09-14 from dps.texas.gov)
- src/assets/drivers-manuals/TX.pages.txt (plain pdftotext over that PDF; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/SOURCES.json (sha256, folio offset 6, nonLawPages, the four extraction traps and the extraction flag, each with its measured basis)
- docs/plans/texas-exam-shape.md (the search that established that no official source states the question count, and the two decoys it disposes of)