Class 4 Knowledge and Rules of the Road
What a Class 4 licence covers
Alberta's Class 4 permits you to drive taxis, buses carrying passengers, and small commercial vehicles such as ambulances and limousines, while still allowing you to drive any Class 5 vehicle. The knowledge test tests three layers at once: general rules of the road, passenger-carriage responsibilities, and the extra duty of care that comes with carrying paying passengers.
Core rules to master
Know speed limits (50 km/h in urban areas unless posted, 80 km/h on highways unless posted), the two-second following rule and how to extend it, right-of-way at uncontrolled intersections, four-way stops, and roundabouts, plus school-zone and playground-zone rules. Passenger-specific content includes seat-belt and child-seat obligations, loading and unloading passengers only where safe and legal, refusing to carry unruly passengers, and never leaving passengers unattended in a running vehicle.
Traps in questions
Questions love absolutes. "Always" and "never" answers are often wrong except where the law genuinely is absolute - for example, you must stop for a school bus with flashing red lights in both directions on an undivided road. Watch for posted-versus-default speed limits, the difference between a stop and a yield, and the fact that a flashing yellow light means proceed with caution, not stop. Distinguish hand signals from mechanical signals and remember that a passenger vehicle must not stop in a no-stopping zone even to pick up a fare.
Worked example
You approach a four-way stop at the same moment as a vehicle on your right. Both of you arrive simultaneously. Rule of thumb: first to stop, first to go; if truly simultaneous, yield to the vehicle on the right. You wait, then proceed.