Colorado CDL Manual: Study Guide by Section

License classes and the CDL decision chart, the full restriction-code table, medical certification and the notification duties that follow a conviction. This is the chapter Colorado edits most heavily: the instruction-permit checklist, the supervising-driver rule, the state’s broader use of the K restriction, and the English-only testing statement all live here rather than in an appendix.

• A Colorado CLP issued with a passenger or school bus endorsement also carries the P restriction — no passengers in a commercial bus — and one issued with a tank endorsement carries X, no cargo in a commercial tank vehicle. (Colorado CDL Manual DR 2251, Section 1)

Inspection routine, basic control, shifting, seeing and communicating, controlling speed and space, hazard perception, night, fog and winter driving, mountain grades, railroad crossings, skids, emergencies and fitness to drive. Colorado is a state where the mountain-driving material is not academic — escape ramps and long descending grades are ordinary working conditions, and the general knowledge test leans on this section harder than any other.

• The general knowledge test is required of every applicant before Colorado can issue a CDL Instruction Permit. (49 CFR 383.71(a)(2))

Cargo inspection, weight and balance, securement, and the loads that need special attention. Colorado’s grid marks it for the three license classes only — general-knowledge material, not endorsement material.

Bus pre-trip checks, boarding and alighting, prohibited practices, brake-door interlocks and the after-trip inspection. Colorado requires the passenger transport test of every bus driver applicant.

• The passenger endorsement requires a knowledge test and a skills test in a passenger vehicle. (49 CFR 383.93(c)(2))

How the system builds and holds pressure, the dual-circuit design, spring brakes, the inspection sequence, and braking technique on a grade. Colorado footnotes this section in its study grid — study it if you plan to operate air-braked vehicles — and the L restriction is what you get if you do not.

• Colorado’s manual describes the L restriction as no air-brake-equipped commercial vehicle, applied when an applicant skips or fails the air-brake component or tests in a vehicle without air brakes. (Colorado CDL Manual DR 2251, Section 1)

Why combinations roll and jackknife, trailer air-brake systems, anti-lock brakes, and the coupling and uncoupling routine you will be asked to narrate. Colorado’s O restriction turns on exactly this material: pass the skills test in a Class A combination joined by a pintle hook rather than a fifth wheel and you are restricted out of tractor-trailers.

• Colorado applies the O restriction — no tractor-trailer commercial vehicle — when the Class A skills test is taken with a non-fifth-wheel connection. (Colorado CDL Manual DR 2251, Section 1)

Coupling order, converter dollies, the crack-the-whip effect and the multi-trailer air-brake check. Knowledge test only — Colorado adds no skills component for T.

• The doubles/triples endorsement is a knowledge test only. (49 CFR 383.93(c)(1))

Tank inspection, surge and baffles, outage, and the handling penalty of a high, moving center of gravity. On Colorado grades this is the section that turns into a braking problem rather than a trivia question.

• A tank vehicle federally means individual tanks rated over 119 gallons with 1,000 gallons or more aggregate, permanently or temporarily attached. (49 CFR 383.5)

Hazard classes and shipping papers, placarding, segregation, loading and unloading, driving and parking rules, and emergencies. Colorado’s grid marks it for the hazmat endorsement and for tank vehicles — and Section 1 adds the state’s list of what disqualifies you from holding it.

• Colorado hazmat applicants submit fingerprints and clear a federal background check on top of the written test. (Colorado CDL Manual DR 2251, §1.3.6)

Danger zones and mirrors, loading and unloading, evacuation, railroad crossings and student management — with Colorado’s own crossing exemptions written into the text, and a note that each Colorado school district sets its own procedures under state statute.

• Colorado state statute makes each school district responsible for establishing its own loading and unloading procedures, on top of the manual’s rules. (Colorado CDL Manual DR 2251, §10.2)

The model versions of the three segments: the walk-around you narrate, the measured backing exercises, and the road drive. Colorado marks all three for Class A, B and C and for the passenger and school bus endorsements — then immediately follows them with its own rewritten pair.

• The skills test must be taken in a vehicle representative of the group the applicant wants to be licensed for. (49 CFR 383.91(b))

The Colorado-modified pair, and the reason this manual runs longer than most. 11M walks the inspection in the order a Colorado examiner takes it — in-vehicle and engine start, the air or hydraulic brake check, passenger and school-bus-only items, the lights operations check, then the external walk-around and axle and steering components. 12M does the same for the measured backing exercises and how they are scored. If you only read the generic sections you will be inspecting the right truck in the wrong order.

• Colorado’s 11M inspection sequence starts inside the vehicle at engine start and moves to the brake check before any part of the external walk-around. (Colorado CDL Manual DR 2251, §11M.1)
• Colorado’s 11M lets a candidate mark inspection items as completed, but forbids any additional markings on the vehicle. (Colorado CDL Manual DR 2251, §11M.1)