Road rules
The two-second and four-second rules: a learner's guide
In this guide
Understand what the time represents
A time gap measures how long after the vehicle ahead you pass the same roadside point. NZTA's method uses a fixed landmark to check the gap. It is not the number of metres between bumpers, and it is not a promise that a vehicle can always stop within that time. Reaction and braking both take time.
Match the gap to the situation
NZTA recommends increasing the normal two-second gap to four seconds for wet or slippery conditions, bad weather or towing. It also advises a bigger gap if you are tired or your reaction time is slower. Read every part of a question: a phrase about rain or a trailer can change the relevant guidance.
Practise the explanation
When reviewing a question, ask why the condition matters. A useful explanation connects the environment to your opportunity to react and stop. If all you remember is a number, return to the Road Code discussion before trying another set. Your goal is to recognise a changing situation, not simply match a keyword.
Do not turn a minimum into a target
The official guidance is a starting point for safe judgement, not an instruction to stay as close as possible. During supervised practice, discuss visibility, road surface and traffic with your supervisor. Never use a phone or a study app while driving. Keep study exercises for when you are safely parked or outside the vehicle.
Add one useful review note
Write the conditions you missed and the reasoning behind the answer. Keep that note with related material on speed, weather and hazards so the topics reinforce each other. The next time you take a mixed mock, check whether you noticed the conditions without being prompted.
Sources & further reading
Sources checked 28 September 2026. Rules and processes can change; use the official guidance for your circumstances. Study suggestions are NZ Learner’s original editorial guidance.
Independent learning guidance for Class 1 car learners. Not an official test, booking service or guarantee of passing.