What causes the car to deviate during Subject Three driving test?

[Correia]

The main reasons for a car deviating during the Subject Three driving test are threefold: 1. Driving tire pressure: Inconsistent driving tire pressure causes uneven wear between the driving wheels and the ground, leading to deviation. 2. Suspension system failure: Issues such as suspension damage, deformation, or misalignment can cause the car to deviate. 3. Unequal wheelbase on both sides: When the car is moving, it will tend to deviate towards the side with the shorter wheelbase. Below is relevant information: 1. Driving phenomenon: Car deviation refers to the tendency of a car to automatically steer left or right when driving at a constant speed on a flat, straight, dry, and clean cement or asphalt road after releasing the steering wheel, resulting in the centerline of the front and rear axles not aligning with the centerline of the driving trajectory. 2. Influencing factors: Due to factors such as car structural design and manufacturing precision, a car that does not deviate at all does not exist. Typically, if a car deviates more than 5 meters when driving 1000 meters on a flat straight road, it can be considered as deviation.