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How To Check Your Blind Spots When Driving

A cyclist riding alongside a car in its blond spot

There are many potential dangers on the road, and missing things in your blind spots is a factor in many car accidents in the UK. Blind spots are areas that are obscured from your view in the driver’s seat, and big enough to hide entire vehicles. They pose a particular danger when you set off from standstill and when you change lanes, because you might not see cars, bikes and motorbikes as they come up alongside you.

But it’s not all bad news: checking your blind spots when you’re driving is actually pretty simple, and an easy way to prevent possible collisions. To help make you a safer driver—and to help you coast your driving test—we’re here to teach you where your blind spots are, and when and how to check them.


What are your blind spots when driving?

Although your mirrors (if they’re set up correctly) show most of what’s going on behind you, there are zones they don’t quite reach. You car can also hide sections of the road from view. These are your blind spots: areas that you can’t see, either directly or through your mirrors.

There are two main blind spots that all cars have, although the size of them varies depending on the size and build of your vehicle.

  • Diagonally behind you. You can see vehicles that are further back in or rear or side mirrors, but as traffic pulls up in a lane alongside you, they are hidden from view.
  • Diagonally in front of you. Your car’s bodywork, for example the A-pillars either side of your windscreen, obscure your vision.

When should I check my blind spots?

Slip road traffic merging onto a dual carriageway
Image source: Quaid Lagan via Unsplash

As a driver, you should always remain aware of your surroundings. You can usually do this through a combination of keeping your eyes on the road ahead and regularly checking your mirrors.

However, there are particular times when it’s important to turn your head and make sure there’s nothing in your blind spots. These are:

Before setting off. You need to make sure that you won’t be moving off directly into someone else.

Before changing lanes. Whether you’re overtaking or getting into the right lane for a junction, drivers or cyclists may have pulled up alongside you. On multi-lane roads like motorways, people behind you might also be changing lanes, so the situation can change very quickly; it’s not enough to just look in your mirrors and hope for the best.

When other vehicles are merging into your lane. Drivers wanting to pull out from slip roads, or otherwise merging into your lane, need a clear gap in which to do this. You need to check that you’re not blocking someone’s entry onto your lane. If you are, you should adapt your speed or change lanes accordingly.

Turning into a side road. You should perform a blind spot check before you turn off a road, particularly when you have recently overtaken a cyclist. Otherwise, if the cyclist is close behind you, you might collide with them as they go straight on.

At junctions. Your A-pillars may conceal traffic coming from the left or right. Make sure you make proper observational checks before turning.


How do I check my blind spots?

A taxi driver checking his blind spot
Image source: Lee Blanchflower via Unsplash

It’s easy enough to check your blind spots: just look over your shoulder (to quote The Jackson 5).

Make sure the road is clear:

    • Out of your window, and
    • Out of the back passenger window.

Practice turning your head when you’re stationary in the driver’s seat, so that you know where you’re meant to be looking once you’re on the move. It’ll soon become a natural part of your normal observation routine.

Moving off

Before moving off from the side of the road, you should check all around you. During your driving lessons, you’ll be taught to do this in a clockwise rotation. You should look:

Over your left shoulder

In your left wing mirror

In the rear view mirror

In your right wing mirror

Over your right shoulder

After an emergency stop

You don’t have always have time to check your mirrors before an emergency stop. That’s why you should take particular care to check both blind spots and your mirrors before moving off again.

Setting off again after sitting in traffic

You should check all 3 mirrors before moving off in traffic. In this case, you don’t need to check over your shoulders into your blind spots, but do be aware of cyclists or motorcyclists who may have ridden up alongside you while you’ve been stopped.

At junctions

At junctions, the pillars either side of your windscreen obstruct your vision.

  • Slow down on your approach, so that you can perform the proper observational checks.
  • Move your head slightly forwards to see beyond your A-pillars into the blind spots.
  • Check left and right at least twice to give any vehicles time to move into your line of vision.
A car with its rear light on
Image source: Ulrike Leone via Pixabay

When moving

Usually when you’re driving, we advocate facing forwards. Turning your head too much can mess with your lane positioning. That’s why we have mirrors: so you can check behind you with a quick glance, and keep a general eye on what’s going on.

However, sometimes a mirror check isn’t enough. When you’re changing lanes or other traffic is merging into your lane, you should look both in your mirrors and over your shoulder in the relevant direction to check your blind spot:

First check your rear view mirror

Next look in the appropriate wing mirror

Finally, glance over your shoulder.

That should cover all of the area behind you, so you can safely change lanes without cutting anybody up.

Top Tip

Make sure you sense-check regularly. In driving, this means remaining aware of where other vehicles are all around you, as much as possible. Take note of other drivers in your mirrors; if you can see them in one instance, but can’t the next time you check, they might well have found their way into your blind spot.


Checking your blind spots during the driving test

If you don’t check your blind spots when moving off during your driving test, you will receive a fault. If you’re in a position that means your failure to check is potentially dangerous, you’ll get a serious fault—meaning an automatic fail. Not moving off safely was in the top 10 most common reasons for failing a driving test during 2019/20.


FAQs

① What do I do if someone cuts me up?

If you think someone has missed you in their blind spot and you need to make them aware of your presence, you should use your horn. Change your speed if you can, to create a greater distance between the two of you.

② How can I be aware of other drivers’ blind spots?

Just as you have blind spots, so does every other driver. On lorries or other long vehicles, you might see a sign on the back saying: ‘If you can’t see my mirrors, I can’t see you.’ But, as we’ve seen, car drivers also face this issue. If you’re alongside someone on the road, they might not be aware that you’re there. That’s why being aware of other drivers’ indicators is also crucial.

③ Can I use blind spot mirrors?

You can buy mirrors that clip onto your existing wing mirrors, which widen your field of vision. However, you should use these as well as, not instead of, manually checking over your shoulder for people in your blind spot.

Most driving instructors won’t have blind spot mirrors, as they need to make sure you can drive using regular mirrors.


Observational skills and indicating properly are the key to avoiding cutting up other drivers—are you confident in these areas of driving?

By Katie Scott

Katie grew up in the middle of nowhere, so knows the true value of getting behind the wheel. From the rules of the road to handy hints and tips, she'll give you the lowdown on all things driving. Always on the move, when she's not in the car, you'll probably find Katie darting around the squash courts or out running in the rainy British countryside.

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