Most learners think braking starts the moment they see danger, but there's a delay first: the time it takes your brain to process the hazard and your foot to reach the brake. At 60 km/h, an average reaction time of about 1.5 seconds means the car has already travelled roughly 25 metres before the brakes even engage. Add the braking distance on top of that, and total stopping distance is often much longer than drivers expect. This is why following distance matters so much — it's the buffer that covers your reaction time, not just your braking. Fatigue, distraction and alcohol all lengthen reaction time, which is why they're so dangerous even at legal speeds.
Source: K53 Defensive Driving Manual
Frequently Asked Questions
What is the difference between reaction distance and braking distance?
Reaction distance is how far your car travels before you physically start braking, from the moment you notice a hazard. Braking distance is how far it travels once the brakes are applied. Stopping distance is the two added together.
Does speed affect stopping distance?
Yes, significantly. Braking distance increases roughly with the square of your speed, so doubling your speed can more than double how far it takes to stop.
How can a learner improve reaction time?
Staying well-rested, avoiding distractions like phones, and constantly scanning the road ahead for potential hazards all help you react sooner rather than later.
Why does following distance matter if I brake in time?
Following distance is your safety margin for exactly this reaction gap — if the car ahead stops suddenly, that gap is what stops you rear-ending them before your brakes even bite.