ICBC Commercial Knowledge Test 2026 – Free BC Class 1–4 Questions

Class 1 to 4 and what each covers, minimum ages, the air brake (code 15) and heavy trailer (code 20) endorsements, the driving record and medical rules, learner supervision, MELT and retest waiting periods.

How brakes turn motion into heat, stopping time and following distance, speed and weight effects, brake fade, retarders, downgrades, water, runaway lanes and ABS.

Following distance, danger zones, off track and turns, curves, roundabouts, backing, mirrors, emergency vehicles, double-clutching, railway crossings and night driving.

Tire pressure and tread limits, wheel checks, required braking systems, flashing lights, warning devices for disabled vehicles, carbon monoxide, seatbelts, phones, impoundment and fire fighting.

Starting and warming up a diesel, smart shifting and speed, idling, tire pressure, en route checks and vehicle choices that save fuel.

Backing a semi-trailer, rollovers and load height, double trailers, trailer whipping, parking a trailer and weight distribution on a tractor-trailer.

Coupling and uncoupling a fifth wheel step by step, the tug test, landing gear, pintle hitches, safety chains and drawbars.

Where to place heavy loads on a truck, axle load shares for freight, dump and mixer trucks, covered aggregate loads, livestock and liquid tank loads.

The North American cargo securement standard, tiedown condition, how many tiedowns and how strong, binders, front-end structures, load projections and vehicles carried as cargo.

Height and width limits, mirrors, GVW and licensed GVW, overload and oversize permits, pilot cars and reporting to weigh scales.

Dangerous goods training and documents, reporting spills, placard classes, CANUTEC, runaway lanes, low clearance, transit priority and zone signs.

Bus passenger safety, leaving the curb, transit right-of-way, highway stops, fares, standing passengers, required equipment, baggage and the bus pre-trip.

Which licences cover school buses, daily brake checks, school bus equipment and signs, loading and unloading, flashing red lights and railway crossings.

Class 4 restricted, taxi and limousine definitions, passenger transportation licences, seating, duty to carry and when you may refuse, jump seats and passengers with disabilities.

Licences for ambulances and special vehicles, when emergency vehicles may use lights and sirens, yielding to them, and equipment rules that depend on seating capacity.

On-duty and off-duty time, daily and shift limits, cycles and resets, deferral, sleeper berths, personal use, ELDs and records of duty status, the 160 km exemption and other jurisdictions.

Why air brakes, brake chambers and slack adjusters, s-cam brakes, compressor, governor, reservoirs, foot valve, air dryers and ABS.

The dual foot valve, primary and secondary circuits, one-way check valves, the low-air warning, quick release and relay valves, and what happens when one circuit fails.

Why parking needs mechanical force, how spring brakes apply and release, compounding, caging, blended air and safety actuators.

Supply and control lines, glad hands, trailer emergency application, the tractor protection system, the trailer hand valve and bobtail tractors.

Pushrod stroke limits, checking manual slack adjusters by the applied and pry methods, adjusting them, automatic slack adjusters and common misconceptions.

When inspections are required, which vehicles need written reports, cargo securement re-checks, report rules, pre-trip procedure, brake checks before hills and en route checks.

The Class 1 road test pre-trip: timing, slack adjuster set-up, fifth wheel and landing gear checks, leakage limits with trailers, tug tests and breakaway checks.

The air brake pre-trip on the road test: draining reservoirs, governor cut-out and cut-in, low-air warning, trailer supply valve closing, build-up time and leakage limits.