Does the Texas CDL handbook have errors?

The March 2026 edition (DL-7C) contradicts itself in several places, for example following distance (p. 2-16 vs p. 14-15) and the alcohol chart (p. 2-42 vs p. 1-7). It also still prints bracketed AAMVA template text on pp. 1-8 and 2-19. Source: CDL Mile review of DL-7C (March 2026).

What following distance does the Texas CDL handbook require?

It gives two rules. Section 2 says at least one second for every 10 feet of vehicle length (p. 2-16); Section 14 gives a 4-second rule (p. 14-15). Know both: Section 2 is General Knowledge material and Section 14 is Texas Commercial Rules material. Source: Texas CDL handbook DL-7C, pp. 2-16 and 14-15.

Is the CDL alcohol limit .04 or .08 in Texas?

For commercial drivers it is .04 (p. 1-7). The handbook's Figure 2.23 labels .08 as the drunk driving limit (p. 2-42), which is the general limit for car drivers, not the CDL rule. Source: Texas CDL handbook DL-7C, pp. 1-7 and 2-42.

Texas CDL handbook contradictions to know before the test

The March 2026 Texas CDL handbook (DL-7C) gives conflicting figures in several places, including following distance, what doubling your speed does, and the alcohol chart, and it still prints placeholder text from the AAMVA template. Below is each one with both page numbers, so you can study both.

We found these while writing and checking 425 practice questions against every section of the handbook. They don't make the handbook unusable. It is still the official source, and it's free from Texas DPS. But if two pages disagree, you should know both versions before test day.

Page numbers are the printed page numbers in DL-7C, revised March 2026.

Conflicting figures

Topic	One place says	Another place says	What to do
Following distance	At least one second for every 10 feet of vehicle length (p. 2-16)	A 4-second rule (p. 14-15)	Know both. Section 2 is General Knowledge material; Section 14 is Texas Commercial Rules material.
Doubling your speed	Doubling speed makes braking distance about four times longer (p. 2-14)	Doubling speed makes stopping distance four times longer (p. 14-15)	Stopping distance includes reaction distance, which only doubles. Section 2's wording, braking distance, is the precise one.
Warning devices	One list of required warning devices (p. 2-5)	A different list (p. 14-1)	Learn the Section 14 list for the Texas Commercial Rules test and the Section 2 list for General Knowledge.
Who issues special permits	The Texas Department of Motor Vehicles, TxDMV (p. 14-1)	A "TxDOT Permit Office" (p. 14-11)	Two agencies named for one job. Section 14 opens with TxDMV.
Alcohol limit	Figure 2.23 labels .08 as the "drunk driving limit" (p. 2-42)	Commercial drivers are limited to .04 (p. 1-7)	For a CDL, the rule is .04. The figure shows the general limit for car drivers.
How fast the body removes alcohol	About one-third of an ounce an hour (p. 2-40)	About one drink an hour (p. 2-42), and about .01% every 40 minutes (p. 2-41)	Three ways of putting it. The point that holds in all three: only time sobers you up.
Air pressure build-up and cut-out	Pressure should build from 50 to 90 psi within about 3 minutes, and the governor cuts out at about 120–140 psi (p. 2-4)	Dual systems should build from 85 to 100 psi within 45 seconds (p. 5-7), and cut-out is around 125 psi (p. 5-1)	These describe related but different checks. Learn which figure belongs to which check.

Template text left in

The handbook is AAMVA's model CDL manual adapted for Texas. In two places, text meant to be filled in or replaced still appears in brackets:

Move-over laws (p. 2-19).
Out-of-service penalties (p. 1-8).

Some of the figures in that bracketed text may not match current Texas or federal rules, so we don't test them.

Version footers

151 pages of the March 2026 edition still carry a "Version: July 2017" footer from the AAMVA template. The content was revised; the footer wasn't.

Smaller issues in Section 6 (Combination Vehicles)

Two headings are missing (6.4.3 and 6.4.8).
The tractor protection valve is described in slightly different terms in 6.2.2 and 6.5.2.
The uncoupling steps for pintle hitches read like instructions for a different hitch type.
One spring-brake exemption can be read two ways.

What our practice questions do about it

Our questions avoid testing any point where the handbook contradicts itself. Where both versions could plausibly come up, the explanation teaches both and gives both page numbers. We don't know what's in the DPS test question pool, and nobody outside DPS does.

We aren't affiliated with Texas DPS. If DPS publishes a corrected edition, we'll update this page.

Questions drivers ask

Does the Texas CDL handbook have errors?: The March 2026 edition (DL-7C) contradicts itself in several places, for example following distance (p. 2-16 vs p. 14-15) and the alcohol chart (p. 2-42 vs p. 1-7). It also still prints bracketed AAMVA template text on pp. 1-8 and 2-19.; Source: CDL Mile review of DL-7C (March 2026)
What following distance does the Texas CDL handbook require?: It gives two rules. Section 2 says at least one second for every 10 feet of vehicle length (p. 2-16); Section 14 gives a 4-second rule (p. 14-15). Know both: Section 2 is General Knowledge material and Section 14 is Texas Commercial Rules material.; Source: Texas CDL handbook DL-7C, pp. 2-16 and 14-15
Is the CDL alcohol limit .04 or .08 in Texas?: For commercial drivers it is .04 (p. 1-7). The handbook's Figure 2.23 labels .08 as the drunk driving limit (p. 2-42), which is the general limit for car drivers, not the CDL rule.; Source: Texas CDL handbook DL-7C, pp. 1-7 and 2-42

Source: Texas Commercial Motor Vehicle Drivers Handbook (DL-7C), revised March 2026. Last checked November 4, 2026. CDL Mile is independent and not affiliated with Texas Department of Public Safety. Get your free score