A blind spot is what a mirror is not
Your mirrors give you three narrow views: one straight back through the rear window, and one down each flank. Between the edge of what the door mirror shows and the edge of what you can see by looking out of the side window, there is a wedge of road that appears in neither. That wedge is the blind spot, and a car can sit in it comfortably.
It is not a defect in the mirror. It is geometry. Regulation 204(1)(b) requires a mirror that shows you a clear reflection of traffic to the rear — behind you. A vehicle drawing level with your back door is no longer behind you, which is precisely why the law also requires, in 204(1)(a), that the vehicle afford the driver a full and clear view of the roadway ahead and to the right and left.
So mirrors and the head turn are not two ways of doing the same job. They cover different areas, and the second one is the one you have to remember.
The mirrors the law requires
Regulation 204 sets a different requirement for each class of vehicle. The dates matter: the two-mirror rules apply to vehicles first registered on or after 1 January 1987.
| Vehicle | What must be fitted |
|---|---|
| Any motor vehicle | A rear-view mirror or mirrors that let the driver, in the driving position, see a clear reflection of traffic to the rear in clear weather. A tractor is exempt |
| A motor car, minibus, bus or goods vehicle with a gross vehicle mass of 3 500 kg or less | An exterior mirror on the driving side and an interior mirror. If the interior mirror cannot show a clear reflection of traffic to the rear, an exterior mirror on the other side instead — and then no interior mirror is needed |
| A minibus, bus or goods vehicle over 3 500 kg | An exterior mirror on the driving side and an exterior mirror on the opposite side. No interior mirror in the list at all |
| A motorcycle, motor tricycle or motor quadrucycle | A mirror on the right side of the handlebars and a mirror on the left side of the handlebars |
Notice what the heavy-vehicle and motorcycle rows have in common: no interior mirror. A vehicle with no rear window has nothing for one to look through.
The standard a mirror has to meet
- From where
- The driving positionNot leaning across, not from outside the car
- In what conditions
- Clear weather
- Showing what
- A clear reflection of traffic to the rear
- The get-out
- There isn't oneIf the interior mirror cannot do it, the law requires a second exterior mirror instead
- Ahead and to the sides
- A full and clear view of the roadway ahead and to the right and leftRegulation 204(1)(a) — a loaded car with a blocked window fails this, not the mirror rule
When the official manual tells you to check the blind spot
The blind-spot check is not a piece of driving-school folklore. It appears in the Department of Transport's own learner-driver manual as the prescribed action for three road markings, and each one tells you something about when it matters.
At mandatory direction arrows, the manual's instruction is to check your blind spot before turning right, in case a vehicle in the lane beside you — a lane whose arrow says it must turn right — carries straight on instead.
At continuity lines, which warn that your lane is about to leave the road, the instruction is to check your blind spot to make sure no other vehicle is about to cut in front of you.
At lane reduction arrows, where two lanes merge into one, it says to check both blind spots, because a vehicle on the other side is changing lanes at the same moment you are.
The pattern is worth naming: the blind spot matters whenever somebody else may be moving sideways into the same piece of road as you.
Mirror, signal, then move
This is the manual's own order, taken from the answers it publishes to its own sample questions on vehicle controls.
| Step | Why it comes where it does |
|---|---|
| Mirror | The manual's answer to "which control is used before changing the speed of the vehicle" and to "which control is used before applying the brake" is the centre rear-view mirror. Its note on that control says the driver must ALWAYS first check the mirrors, to be aware of the traffic situation behind |
| Blind spot | What the mirror cannot show you. The manual attaches this check to turning right and to changing lanes |
| Signal | Regulation 300 requires a conspicuous signal of your intention to stop, to suddenly reduce speed, to turn left or right, or to move left or right on the roadway — of a duration sufficient to warn anyone approaching from the front, the rear or the side |
| Move | Regulation 299(3): on a road divided into lanes, you may not turn from one lane into or across another unless you can do it without obstructing or endangering other traffic |
Signalling is not permission. Regulation 299(3) is a condition on the movement itself, so an indicator does not transfer the responsibility for the gap to anybody else.
A motorcycle has no interior mirror
Regulation 204(1)(e) requires a motorcycle, motor tricycle or motor quadrucycle to carry a mirror on the right side of the handlebars and a mirror on the left side of the handlebars. That is the whole requirement, and there is nothing in it about a rear window, an interior mirror or a driving side.
So a motorcycle applicant studying the controls section is looking at a different answer from a car applicant. In the Department of Transport's motorcycle control list, control 3 is "left and right rear view mirrors", and it is the answer to every question about monitoring the traffic situation to the rear. There is no control 1 to be the interior mirror.
The practical point is larger than the exam point. A rider's mirrors are mounted on the handlebars, so they move with the steering and are partly filled with the rider's own shoulders. The head check is doing more of the work on a motorcycle than it does in a car, not less.
This is why the controls section is tied to your licence class at all: regulation 104(2)(a)(iii) requires the examiner to test the controls of a vehicle of the class you applied for. Rules of the road and road signs are common to everybody. Mirrors are not.
The mistake
Treating the mirror check as the whole observation. A clean mirror check and no head turn is exactly how a car that has been overtaking you for the last three seconds gets missed — it left the mirror's field of view the moment it drew alongside.
The second one is checking, then signalling, then waiting. The gap you looked at has moved. If the manoeuvre is delayed, the observation is stale and it has to be done again.
Find out which section is actually costing you
Mirrors sit in vehicle controls, the observation rules sit in rules of the road, and the markings that call for a blind-spot check sit in road signs. The free readiness test scores all three separately.
Take the free readiness testCommon questions
What is a blind spot?
The area beside and behind your vehicle that your mirrors do not cover and that you cannot see looking forward. A whole car can sit in it. The only way to check it is to turn your head.
When should you check your blind spot?
Before turning right and before changing lanes. The Department of Transport's learner-driver manual attaches the check to mandatory direction arrows, continuity lines and lane reduction arrows — in each case, wherever another vehicle may move sideways into your path.
How many mirrors must a car have?
A motor car with a gross vehicle mass of 3 500 kg or less, first registered on or after 1 January 1987, must have an exterior mirror on the driving side and an interior mirror. If the interior mirror cannot show a clear reflection of traffic to the rear, an exterior mirror on the opposite side is required instead.
How many mirrors must a motorcycle have?
Two. Regulation 204(1)(e) requires a mirror on the right side of the handlebars and a mirror on the left side of the handlebars.
What is the legal standard for a rear-view mirror?
That the driver, in the driving position, can see a clear reflection of traffic to the rear in clear weather. That is the test your mirror adjustment has to satisfy.
Does indicating give you the right to change lanes?
No. Regulation 300 requires the signal, and regulation 299(3) separately requires that you not turn from one lane into or across another unless you can do so without obstructing or endangering other traffic. The signal announces the move; it does not authorise it.
Which control is used to see what is to the rear and sides of the vehicle?
In the Department of Transport's car control list, the centre rear-view mirror and the left and right rear-view mirrors together. On a motorcycle it is the left and right rear-view mirrors, which is control 3 — there is no interior mirror.
Sources
- National Road Traffic Regulations, 2000 — regulation 204"Driving view to be unobstructed". (1)(a) the vehicle must afford the driver a full and clear view of the roadway ahead and to his or her right and left; (1)(b) a rearview mirror or mirrors enabling the driver, in the driving position, to see in clear weather a clear reflection of traffic to the rear, with tractors excepted; (1)(c) a motor car, minibus, bus or goods vehicle of gross vehicle mass not exceeding 3 500 kg first registered on or after 1 January 1987 requires an exterior mirror on the driving side and an interior mirror, with the proviso substituting an exterior mirror on the opposite side; (1)(d) the same classes over 3 500 kg require exterior mirrors on both sides; (1)(e) a motor cycle, motor tricycle or motor quadrucycle requires a rearview mirror on the right side of the handlebars and one on the left side.
- National Road Traffic Regulations, 2000 — regulations 299(3) and 300Regulation 299(3): the driver of a vehicle on a public road divided into traffic lanes shall not turn from one lane into or across another lane unless he or she can do so without obstructing or endangering other traffic. Regulation 300: a driver intending to stop, to suddenly reduce speed, to turn left or right, or to move left or right on the roadway shall give a conspicuous signal of that intention, visible to anyone approaching from the front, the rear or the side, and of a duration sufficient to warn them.
- National Road Traffic Regulations, 2000 — regulation 104(2)(a)(iii)The examiner must satisfy himself or herself that the applicant knows and understands the controls of a motor vehicle of the class to which the application relates — which is why the mirror answers differ between a car and a motorcycle applicant.
- South African Learner Driver Manual, Department of Transport (v1.00, June 2012), Road Traffic SignsThe prescribed ACTION for three road markings names the blind-spot check: mandatory direction arrows RM8 ("Check your blind spot before turning right to see that a vehicle in the lane next to you who is suppose to turn right ... is not carrying straight on"), continuity lines WM2 ("Check your blind spot to make sure there are no other vehicles that might cut in front of you") and lane reduction arrows WM6.1 to WM6.3 ("Check both the blind spots where two lanes end from both sides").
- South African Learner Driver Manual, Department of Transport (v1.00, June 2012), section 3 — Vehicle Components and ControlsParagraph 2.5, the note against control 1: "The driver must always first check the mirrors to be aware of the traffic situation behind him or her. This will assist the driver to avoid possible unsafe situations." Paragraph 2.6 gives the mirror as the answer to "which control is used before applying the brake" and "which control is used before changing the speed of the vehicle". Paragraph 1.2 lists control 3 on a motorcycle as the left and right rear view mirrors.
- South African Learner Driver Manual, Department of Transport (v1.01, June 2012), Rules of the Road, section 6.11The syllabus restatement of regulation 204. It drops the registration dates and the mass thresholds the regulation carries, so the regulation is what this page quotes for the detail.
Last updated 2026-09-21.