Answer:
Distance
Explanation:
The only thing that matters before accelerate, brake, or steer, always judge the speed is to ensure that your vehicle wouldn't make any collision with another vehicles or public properties.
Avoiding collision with moving vehicles might need more precaution compared to avoiding public properties since those moving vehicles will not remain in the same place by the time your vehicles initiate the movement.
Because of this, it is important for you to judge the speed and distance used by other road users in order to predict their position by the time you initiate the movement of your vehicles.
