Which of these factors has a direct influence on the braking distance?

The braking distance is the distance a vehicle travels from the moment the brake is applied until it comes to a complete stop. The key factor influencing its length is speed – doubling the speed results in a fourfold increase in braking distance. Other significant factors include the road surface condition (dry, wet, icy), the vehicle's technical condition (mainly tyres and brakes), and its mass.