Ohio (OH) CDL manual 2026

Practice the manual, chapter by chapter

State manuals are built on the same national model, chapter for chapter. One thing to know from each chapter, then real questions from it to answer — tap an option to check yourself.

1. 1

   Introduction

   Everyone

   Serious traffic violations include excessive speeding, defined as 15 mph or more above the posted limit.

   What is the disqualification for a first railroad-highway grade crossing violation?

   1. AAt least 90 days
   2. BAt least 30 days
   3. CAt least 60 days
   4. DAt least 120 days

   How long will you lose your CDL for a first alcohol or felony offense committed while operating a placarded hazmat vehicle?

   1. AAt least three years
   2. BFor life
   3. CAt least one year
   4. DAt least five years
   This chapter has 26 more questions. Practice them in the app and see your pass chance.
2. 2

   Driving Safely

   Everyone

   Not looking properly is a major cause of accidents.

   What is the minimum tread depth required in every major groove on a front (steering) tire?

   1. A6/32 inch
   2. B8/32 inch
   3. C4/32 inch
   4. D2/32 inch

   How often should you take a break on a long trip?

   1. AAbout every 100 miles or 2 hours
   2. BAbout every 250 miles or 4 hours
   3. COnly when you begin to feel drowsy
   4. DAbout every 400 miles or 6 hours
   This chapter has 290 more questions. Practice them in the app and see your pass chance.
3. 3

   Transporting Cargo Safely

   Everyone

   Whether or not you load and secure the cargo yourself, you are responsible for inspecting your cargo and recognizing overloads and poorly balanced weight.

   What do suspension systems carry from the manufacturer, like tires and coupling devices?

   1. AA recommended service interval
   2. BA maximum travel specification
   3. CA weight capacity rating
   4. DA minimum operating temperature

   Which term describes the combined weight of a powered vehicle, its trailer, and all of the cargo being carried?

   1. AGross vehicle weight rating (GVWR)
   2. BGross vehicle weight (GVW)
   3. CAxle weight at the scales
   4. DGross combination weight (GCW)
   This chapter has 26 more questions. Practice them in the app and see your pass chance.
4. 4

   Transporting Passengers

   P endorsement (bus)

   You may lock some emergency roof hatches in a partly open position for fresh air.

   While checking the outside of your bus, you find an emergency exit standing open. What should you do?

   1. ALeave it open for ventilation
   2. BNote it and report it after the run
   3. CTape it in position and continue
   4. DClose it before driving

   You have finished loading at a curbside stop and are ready to rejoin traffic in your transit bus. What should you do first?

   1. ASound the horn twice to warn the vehicles behind you
   2. BTurn on the interior lights so riders can see the aisle
   3. CAccelerate briskly to match the speed of passing cars
   4. DCheck your mirrors for traffic, cyclists, and pedestrians
   This chapter has 98 more questions. Practice them in the app and see your pass chance.
5. 5

   Air Brakes

   Any vehicle with air brakes

   Dual air systems consist of two separate air circuits, usually split front and rear, operated by one set of controls.

   How long a crack in a brake drum or disc is acceptable during inspection?

   1. ANone longer than one inch measured across the surface
   2. BNone longer than one half the width of the friction area
   3. CNone longer than one quarter of the drum circumference
   4. DAny crack that does not pass fully through the drum

   What does the manual identify as the most common problem found in roadside inspections?

   1. AMissing or inoperative lamps
   2. BBrakes out of adjustment
   3. CCargo securement violations
   4. DTires below minimum tread depth
   This chapter has 148 more questions. Practice them in the app and see your pass chance.
6. 6

   Combination Vehicles

   Class A

   On sliding fifth wheels, all locking pins must be present and fully engaged before driving.

   Whenever you back with a trailer, how should you try to position the vehicle first?

   1. ASo the tractor is jackknifed about 30 degrees
   2. BSo the trailer tandems are slid fully forward
   3. CSo you can back in a straight line
   4. DSo the trailer is angled toward the passenger side

   While listening to the trailer brakes during coupling, what should you hear?

   1. AAir escaping continuously from both glad hand seals
   2. BA steady hiss that slowly fades as the tanks fill up
   3. CThe brakes move on application, air escapes on release
   4. DThe relay valve clicking once and then staying silent
   This chapter has 118 more questions. Practice them in the app and see your pass chance.
7. 7

   Doubles and Triples

   T endorsement

   Lower fifth wheel check: securely mounted to the frame, no missing or damaged parts, enough grease.

   When hooking air lines between the first trailer and the converter dolly, how do you avoid crossing them?

   1. ATrace both lines back to the tractor before each trip segment
   2. BConnect only the emergency line, since the service line is optional
   3. CConnect whichever glad hand physically reaches its mate first
   4. DMatch service to service and emergency to emergency by color code

   Which air lines must continue past the converter dolly to reach the second trailer of a set of doubles?

   1. ANeither; the dolly's tank supplies the rear trailer
   2. BBoth the service line and the emergency line
   3. COnly the service line
   4. DOnly the emergency line
   This chapter has 98 more questions. Practice them in the app and see your pass chance.
8. 8

   Tank Vehicles

   N endorsement

   Outage is required because liquids expand when warmed, so a tank must never be loaded completely full.

   What must you verify about the manhole covers themselves during a tank inspection?

   1. AThat they carry the tank's re-test date
   2. BThat they are painted the same color as the shell
   3. CThat they can be opened without tools
   4. DThat they have gaskets and close correctly

   Besides leaks, what condition of the tank's body or shell does the inspection cover?

   1. ACondensation on the upper surface
   2. BDents
   3. CChalk marks left by the loading rack
   4. DFading of the painted shipping name
   This chapter has 62 more questions. Practice them in the app and see your pass chance.
9. 9

   Hazardous Materials

   H endorsement

   Table 2 lists 4.2 Spontaneously Combustible with the placard name Spontaneously Combustible.

   Which division number covers explosives with a mass explosion hazard?

   1. ADivision 1.5
   2. BDivision 1.1
   3. CDivision 1.3
   4. DDivision 1.6

   What does the manual require for materials subject to spontaneous combustion or heating?

   1. AVehicles with sufficient ventilation
   2. BTransport only during daylight hours
   3. CA dedicated fire watch in the cargo area
   4. DRefrigerated transport at all times
   This chapter has 234 more questions. Practice them in the app and see your pass chance.
10. 10

    School Buses

    S endorsement

    When possible, assign two responsible, older student assistants to each emergency exit and teach them how to assist the other students off the bus.

    A student who just exited your bus drops a book, and it slides underneath the bus. What should the student have been taught to do?

    1. ALeave the item, move away from the bus, and get the driver's attention for help
    2. BCrawl under the bus quickly while the red lights are still flashing
    3. CWait quietly beside the rear wheels until the driver finishes the route
    4. DKnock on the service door and reach beneath the bumper for the item

    What should be switched on while loading students in the dark?

    1. AThe stepwell heater lamp
    2. BThe dome light
    3. CThe high beam headlights
    4. DThe rear cargo lamp
    This chapter has 98 more questions. Practice them in the app and see your pass chance.
11. 11

    Pre-Trip Vehicle Inspection

    Everyone (skills test)

    Without restarting the engine, begin fanning off the air pressure by applying and releasing the foot brake and identify the level at which the low air warning devices activate.

    What must be true of the light lenses on the front of the vehicle?

    1. ATinted to reduce glare for oncoming drivers
    2. BSealed with silicone around every edge
    3. CProper color, clean, not broken and not missing
    4. DReplaced whenever the bulb is changed

    Which lights should you turn on before starting the exterior walk-around portion of your inspection?

    1. AParking lights and the interior dome light
    2. BHigh beam headlights and the front fog lamps
    3. CLow beam headlights and the four-way flashers
    4. DLeft turn signal and all the clearance lights
    This chapter has 200 more questions. Practice them in the app and see your pass chance.

The official Ohio CDL manual