Ontario MTO Truck Knowledge Practice Test 2025 – The Comprehensive All-in-One Guide to Exam Success!

Maintaining traction primarily depends on the interaction between a vehicle's tires and its suspension system. Tires are crucial as they provide the necessary grip on the road surface. The type of tires, their tread patterns, and their condition significantly affect how well the vehicle can maintain traction under various conditions, such as wet, dry, or icy roads.

The suspension system plays a vital role in ensuring that the tires remain in contact with the road surface. It absorbs shocks from the road, enhances vehicle stability, and allows for better handling. By keeping the tires correctly aligned and maximizing surface contact, the suspension system helps optimize traction during acceleration, braking, and cornering.

The other options, while critical for vehicle operation and safety, do not directly influence traction. Brakes and headlights serve functions related to safety and control but do not affect the vehicle’s grip on the road. The engine and transmission are essential for power delivery and speed but not for traction maintenance. Windshield wipers and mirrors are crucial for visibility and safety but do not contribute to traction on the road.