Colorado Class B to A Upgrade Theory
A focused guide for Colorado Class B CDL holders upgrading to Class A: exactly what is new, which knowledge and skills tests you will take, and the combination vehicle material to study, with 57 practice questions and 120 days of access.
Overview
Theory review for Class B CDL holders upgrading to Class A, covering combination vehicle operation, coupling, and HOS.
Class B to A Upgrade Theory for Colorado CDL Applicants
Colorado drivers navigate mountain grades and energy-sector hauls across the Rocky Mountain corridor. With oil and gas field services, agriculture, ski resort and mountain freight driving much of the freight in Colorado, the Class B to A Upgrade Theory material below is the part of the Colorado CDL that those employers screen for first.
Upgrading from Class B to Class A in Colorado means passing the Combination Vehicles knowledge test at Colorado Division of Motor Vehicles (and Air Brakes if not already held), then a skills test in a Class A combination. This is the theory part.
Where Colorado drivers use this
- Agriculture: refrigerated produce loads to distribution centers and out of state
- Ski resort and mountain freight: event and production freight moving between venues
- Aerospace components: flatbed and step-deck loads of steel, lumber, and building materials
- Oil and gas field services: crude, fuel, and chemical tankers (N and H endorsements) serving the energy sector
- Agriculture: refrigerated (reefer) loads of produce and food moving to distribution centers and out of state
Most Colorado CDL work runs the I-25, I-70, I-76 corridors and the Denver area, so the examples in the practice questions lean on the vehicles and loads you will see there.
Testing, appointments, and fees are handled by Colorado Division of Motor Vehicles. See the Colorado CDL classes and Colorado endorsements pages for the full licensing picture.
Common Colorado questions
- Is this Class B to A Upgrade Theory material specific to Colorado?
- Yes. The knowledge test content is federal (49 CFR 383), so the questions apply in Colorado, and this page adds Colorado details: where you test (Colorado Division of Motor Vehicles), which Colorado industries use this license, and the Colorado corridors the examples are drawn from.
- Where do I take the Class B to A Upgrade Theory knowledge test in Colorado?
- Knowledge tests are given by Colorado Division of Motor Vehicles. Bring your Colorado driver license, proof of residency, and your medical certificate; most Colorado offices require an appointment for CDL testing.
- How long do I have to study the Colorado Class B to A Upgrade Theory material?
- Access lasts 120 days from purchase, which is enough to study, take the practice tests, and pass at Colorado Division of Motor Vehicles with time to spare. Retakes in Colorado are allowed after a short wait, so a second attempt is covered too.
When Is This Useful?
Helps drivers expand from heavy single vehicles into tractor-trailers and other combination vehicle work.
Who Is This For?
Current Class B CDL holders upgrading to Class A.
Topics Covered
Moving from Class B to Class A means operating vehicles with very different handling: longer wheelbase, trailer swing, and off-tracking on turns. This module explains the physics behind combination vehicle behavior as tested on the Combination Vehicles knowledge exam.
Proper coupling procedure is a primary topic on the Combination Vehicles written test and a required demonstration during the Class A skills test. You will learn the sequence that must be followed correctly to pass both the written and practical portions.
Connecting and managing the service and emergency air lines between tractor and trailer is a skill Class B drivers do not typically practice. The exam tests both the correct connection procedure and what happens when those connections fail at speed.
Class A drivers commonly operate in interstate commerce, where federal Hours of Service rules govern maximum drive time, required rest periods, and logging requirements. This section covers the limits, exceptions, and logging concepts that appear on the CDL knowledge exam.
Included in these packages
Get Class B to A Upgrade plus more, for less than buying separately.