Concentration, speed, load and grip affect following distance

A less attentive driver may take longer to react, higher speed covers more ground before braking and a heavy load can increase the distance needed to stop. Tyre condition and available grip also affect the margin required. The number of lanes, the size of the vehicle ahead considered by itself, the number of gears or wheels and the type of power steering are not calculation criteria. Consider the factors that genuinely affect perception, reaction and braking.