Pick a fixed object ahead
A sign, a power pole, a line marking, anything stationary beside the road.
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Following too closely is one of the habits learners cannot see in themselves. An instructor beside you can call it in the moment, which is the only way it changes.
The short answer
A three-second gap is a minimum, not a guarantee
This trips people up on the knowledge test. The statement that a three-second gap always leaves enough distance to stop safely in poor conditions is false. Three seconds is the baseline for good conditions on a dry road. Rain, night, fog, a heavy load or a tired driver all mean you need more.
How to measure it
Counting a three-second gap while you drive
Start counting when the car ahead passes it
Say "one thousand and one, one thousand and two, one thousand and three" at a steady pace.
Check where you are at three
If you reach the object before you finish counting, you are too close. Ease off and let the gap rebuild.
Recount after every change
Traffic speed, a new road, rain starting. Any of these changes the gap you need, so measure again rather than assuming.
Why the gap has to be that big
Stopping distance is reaction distance plus braking distance
Most drivers think about braking and forget the first half, which is often the larger of the two at low speed. Liverpool driving lessons practise both, from the 40km/h zones around Liverpool Hospital to the Hume Highway.
Reaction distance is how far you travel between seeing a hazard and your foot actually reaching the brake. It takes roughly one and a half seconds for most alert drivers, and at suburban speeds that is already several car lengths.
Braking distance is what happens after that, and unlike reaction distance it does not grow evenly with speed. Doubling your speed roughly quadruples the distance needed to stop.
How speed changes it
Why a small speed increase costs a lot of distance
These are typical published figures for an alert driver in a well-maintained car on a dry road. Treat them as illustrative rather than exact, because tyres, surface, load and driver all move the result.
| Speed | Roughly how far to stop, dry | What that means in traffic |
|---|---|---|
| 40 km/h | Around 26 metres | A school zone. Around six car lengths before you are stopped. |
| 60 km/h | Around 45 metres | A typical suburban street. The distance has nearly doubled for a 20 km/h increase. |
| 80 km/h | Around 70 metres | An arterial road. Reaction distance alone is now over 30 metres. |
| 100 km/h | Around 98 metres | A motorway. Close to a full football field before you stop. |
Wet roads
Rain changes the arithmetic more than drivers expect
A wet surface can push stopping distance far beyond the dry figure at the same speed, and the first rain after a dry spell is the worst of all as oil lifts off the road.
The practical response is not only a longer gap. It is a lower speed, earlier braking, smoother steering and low beam headlights so other drivers can see you.
Making it a habit
Following distance is judged, not calculated
Nobody counts seconds continuously while driving. The counting is a calibration exercise you do occasionally until the correct gap simply looks right.
Where learners go wrong
The common pattern is a good gap on an empty road that quietly closes in traffic, because keeping the gap means letting other cars merge into it. Holding the space when it feels socially awkward is the actual skill.
Wet weather practice is worth doing deliberately rather than avoiding, because judging grip on a wet road is not something reading can teach.
Rainy and wet weather driving lessons Night driving lessons Driving test preparation and practice test
Official NSW guidance
Road rules, penalties and published stopping figures change. Confirm current detail against official sources rather than any article.
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Frequently asked questions
Following distance questions drivers ask
Use the official links on this page to confirm current rules for your situation.
In poor conditions, does a three-second gap always leave enough distance to stop safely?
No. Three seconds is the minimum for good conditions on a dry road. In rain, fog, at night, or when you are tired or carrying a load, you need more. Four to five seconds is the usual advice in the wet.
How do I measure a three-second following gap?
Pick a fixed object beside the road. When the car ahead passes it, count "one thousand and one, one thousand and two, one thousand and three". If you reach the object before finishing the count, you are following too closely.
What is the difference between braking distance and stopping distance?
Braking distance is how far you travel once the brakes are applied. Stopping distance is that plus reaction distance, which is how far you travel between seeing the hazard and your foot reaching the pedal. At suburban speeds the reaction part is already several car lengths.
How much does wet weather increase stopping distance?
Enough that you should treat the dry figure as optimistic. A wet surface reduces grip and lengthens braking considerably, and the first rain after a dry spell is worst because oil lifts off the road surface.
Does ABS mean I can follow more closely?
No. Antilock braking helps you keep steering control during hard braking, which is valuable, but it does not remove your reaction time and it cannot create grip that the surface does not have. Following distance should be unchanged.
Why does stopping distance grow so fast with speed?
Reaction distance grows evenly with speed, but braking distance grows far more steeply. Roughly, doubling your speed quadruples the distance needed to brake, which is why a small speed increase costs more distance than most drivers expect.
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