Blind spots: when to check and how to do it properly

Blind spots: when to check and how to do it properly

The simple answer is this: check the relevant blind spot whenever you are about to move the car sideways, move off from a stop, join another flow of traffic, reverse, or put your vehicle where someone could already be. You do not need to swing your head around at every tiny steering input, but you do need a positive look before changing position if another road user could be hidden beside you.

In the car, I describe it to learners as a quick, purposeful shoulder check. Use your mirrors first to build the picture, then turn your head just enough to see the area the mirrors cannot cover. If you are moving off from the left kerb, that usually means checking over your right shoulder. If you are pulling in to the left, it often means checking the left mirror and left blind spot for cyclists, pedestrians, scooters and anyone filtering up the inside.

This is general driving guidance, not legal advice. The Highway Code supports the habit: Rule 159 says that before moving off you should use all mirrors, look round to check the blind spots, and signal if necessary. Rule 161 says you should use mirrors effectively throughout your journey. On test, the examiner is not looking for theatre. They are looking for safe, well-timed observation before you commit the vehicle.

What is a blind spot in a learner car?

A blind spot is any area around your vehicle that you cannot see clearly by looking ahead or using your mirrors. The classic one is just over your right shoulder, where a cyclist, motorbike or car can sit slightly behind and beside you. There is also a left-side blind spot, a rear blind area when reversing, and small blocked views caused by pillars, head restraints, passengers, rain, glare or parked vehicles.

Modern cars often have bigger pillars and smaller rear windows than learners expect. Even with correctly adjusted mirrors, you can lose a whole motorcyclist in the space between your interior mirror and door mirror view. I see this most when a learner says, “There’s nothing there,” then a bike appears level with the rear door a second later.

Blind spot monitoring systems can help in some cars, but they do not replace observation. Sensors can miss smaller objects, may not read every situation, and can be affected by weather or dirt. If you take a driving test in a car with driver assistance, you are still responsible for safe observation and control.

• Right blind spot: traffic coming from behind when moving off, changing lanes or leaving the kerb.
• Left blind spot: cyclists, pedestrians and scooters when pulling in, turning left or moving left in traffic.
• Rear blind area: children, low walls, bollards and pedestrians when reversing.
• Pillar blind spots: momentary hidden areas at junctions, roundabouts and crossings.
• Mirror gaps: the area between what the interior mirror shows and what the door mirror shows.

When you must check blind spots

The most common test situation is moving off. If you are parked on the left and intend to move into the road, the right blind spot is essential because that is where the immediate danger can be. The fault I see again and again is a learner checking the mirrors nicely, signalling, then releasing the clutch before looking over the shoulder. The check has to come before the car moves.

You also need blind spot checks when changing lane, passing parked vehicles if you are moving out significantly, rejoining after a bus lane or slip road, moving away after an emergency stop exercise, and when pulling up on the left. If you are changing your road position enough that another road user could be affected, ask yourself, “Who could be beside me?”

At low speed, blind spots matter just as much. In car parks, on narrow streets, around schools and when reversing, the danger is often a pedestrian, child, dog walker or cyclist close to the car. Rule 202 of the Highway Code says to look carefully before you start reversing and to be aware that there may be blind areas behind you.

• Move off from the kerb: mirrors, signal if needed, right shoulder blind spot, then go if safe.
• Change lane: mirrors, signal where necessary, relevant shoulder check, then gradual movement.
• Pull in to the left: left mirror and left blind spot before moving towards the kerb.
• Pass a parked vehicle: check before moving out if your position changes into another road user’s path.
• Reverse: all-round observation before and during the manoeuvre, including blind areas behind.
• After stopping unexpectedly: repeat the full observation before moving off again.

How to do a proper blind spot check without losing control

A good blind spot check is brief and controlled. Turn your head, not your whole body, and keep your hands steady. You are not trying to stare behind you for two seconds. You are confirming whether the space beside and slightly behind the car is clear before you move. If you look for too long, the car can drift, your speed can drop suddenly, or you can miss what is happening in front.

I teach learners to separate looking from moving. First, gather information. Then decide. Then steer. Problems happen when a learner starts steering at the same moment as turning their head. The car naturally follows the body, especially at low speed, so the vehicle can wander towards the very hazard you were meant to avoid.

If the road situation is busy, one blind spot glance may not be enough. For example, when joining a faster road or changing lane in queuing traffic with motorcycles filtering, you may need mirrors, a shoulder check, a pause, then another mirror check before moving. The observation must be current. A perfect check five seconds ago is no use if the gap has changed.

1. 1Check the interior mirror to understand what is behind you.
2. 2Check the relevant door mirror to see traffic approaching on that side.
3. 3Signal if it will help or warn others, but do not treat the signal as permission to move.
4. 4Take a quick shoulder check into the relevant blind spot.
5. 5Return your eyes to the road ahead and reassess the space.
6. 6Move smoothly only if it is still safe.
7. 7Cancel the signal and settle into the new position.

Mirrors, signal, manoeuvre and where the blind spot fits

Many learners know the phrase mirrors, signal, manoeuvre, but they treat it like a chant rather than a system. The blind spot check belongs in the observation stage before the manoeuvre. In real driving, it often sits after your mirror checks and before the final commitment to steer, move off or reverse.

On a driving test, examiners mark what they can see and what affects safety. If you move off without checking the right blind spot and there is a car, cyclist or van close enough to be affected, that can become a serious fault. If you check but do it too early, then sit still while traffic changes, the examiner may still judge that you moved on out-of-date information.

Signals matter, but they do not clear the blind spot for you. I often see learners put the indicator on and immediately move, as if the flashing light has created a gap. Highway Code Rule 103 says signals warn and inform other road users. They do not give you priority.

• Mirror checks build the picture behind and to the side.
• Signals tell others what you intend, when a signal would help.
• Blind spot checks confirm the area mirrors cannot show.
• Position changes must be gradual, not a sudden swerve.
• A signal without observation is not safe driving.

Common blind spot faults I see on lessons and tests

The biggest fault is the missing shoulder check when moving off. It usually happens because the learner is thinking about clutch, gas, steering and whether to signal. The car moves a metre before the right shoulder check appears. By then it is too late. The examiner wants to see that you knew it was safe before the vehicle entered the traffic stream.

Another common one is over-checking. Some learners look dramatically over both shoulders for almost every parked car, then lose lane discipline or slow down unpredictably. Good observation is relevant. If you are following the bend of your lane and not changing position, mirrors may be enough. If you are moving into a space where someone could be, add the blind spot check.

Late checks at roundabouts also cost people. On a multi-lane roundabout, if you need to move left to exit, you must know what is on your left before you change lane or spiral out. It is not always possible to do a huge shoulder turn, so use mirrors early, keep the car controlled, and take a quick side glance only if it is safe to do so.

• Fault: moving first, checking second. Result: observation is too late to prove safety.
• Fault: only using the right door mirror when leaving the kerb. Result: a cyclist or motorcyclist can be missed.
• Fault: long shoulder stare. Result: drifting, harsh braking or missing the vehicle ahead slowing.
• Fault: checking both blind spots by habit. Result: wasted time and reduced forward awareness.
• Fault: signalling and moving together. Result: other road users get no useful warning.
• Fault: failing to re-check after waiting. Result: the original gap may have disappeared.

Cyclists, motorcyclists and pedestrians in your blind spots

The road users most at risk in blind spots are usually the ones with the least protection. Highway Code Rule 204 reminds drivers that the most vulnerable road users include pedestrians, cyclists, motorcyclists and horse riders. Rule 211 says motorcyclists and cyclists can be difficult to see, especially at junctions, and may come up on either side of you.

As an instructor, I pay close attention to the left side of the car in slow traffic. Learners tend to worry about traffic overtaking on the right, but a cyclist filtering up the nearside can appear just as you turn left, pull in or edge towards the kerb. Before a left turn, check your mirrors in good time and avoid cutting across anyone on your inside.

Pedestrians can be hidden in different ways. When reversing into a bay, a person can walk behind the car after your first observation. When emerging from between parked vehicles, a pedestrian may step out from a pavement gap. This is why blind spot checking is not a one-off event in slow manoeuvres. You keep scanning, stop if unsure, and only continue when the area is clear.

• Before turning left, check for cyclists or scooters on the inside.
• Before opening a door, use mirrors and look behind to avoid someone passing close by.
• Before reversing, look all around and keep checking as the car moves.
• In queues, expect motorcycles and cyclists to filter where space allows.
• Near schools, shops and parked cars, treat blind areas as active hazards.

Practise blind spot checks until they become calm and natural

The aim is not to perform a visible head movement for the examiner. The aim is to make the right observation at the right time without upsetting the car. In lessons, I often start with quiet roads: moving off, pulling up, moving off again, and discussing exactly what could have been hidden. Once the learner understands the reason, the movement becomes more natural.

New drivers should keep the habit after passing. It is very easy, once you are driving alone, to rely on mirrors because nothing bad has happened yet. Blind spot checks are one of those skills that feel unnecessary right up to the moment they prevent a collision. Keep them sharp, especially in cities, at night, in wet weather and anywhere with cyclists or motorcycles.

Use this quick checklist before any position change. If you cannot answer it confidently, slow down, hold your position and gather more information before you move.

• Am I about to move off, move sideways, pull in, reverse or join another flow of traffic?
• Have I checked the interior mirror and the relevant door mirror first?
• Could anyone be hidden beside or slightly behind me?
• Is my shoulder check brief, controlled and on the correct side?
• Has the situation changed since I last looked?
• Can I move smoothly without making anyone brake, swerve or hesitate?