Crash stats don’t lie. Overtaking continues to be one of the most hazardous manoeuvres a rider can perform. The core message that mirror checks alone are insufficient and that well-timed blind spot checks can provide critical and complementary information remains an important one. The coming trend towards technology such as blind spot warning systems may assist us, but I very much doubt they can fully replace these fundamental techniques. Since overtaking is inherently high-risk, anything that reduces the threat should be considered.
Overtaking, lifesavers and following distances
My position on ANY technique that we use whilst on the bike is that it should IMPROVE safety by reducing risk. Or to put it another way, if a technique increases our exposure to risk it’s worth asking if we should be using it. Overtaking is inherently high risk. However good we are, we can only reduce those risks, we cannot make overtaking ‘safe’. Think about it. It’s about the only accident we’d ever accelerate into. But we’re also involving other human beings, and humans don’t always behave predictably. Ovetakes often go wrong when the driver we’re planning on passing does something we didn’t expect. And now we’re carrying a lot of speed. And of course, no matter how fast we think we are, there’s always someone quicker. And they might just possibly be planning on ovetaking too. We need up to date situational awareness before we commit ourselves to an overtake.
A regular ‘advanced riding’ debate is: “should the rider perform a ‘lifesaver’ before pulling out to pass another vehicle?”
As with any question like that, the answer revolves around what we’re attempting to achieve. As explained in another article, the ‘lifesaver’ is a final over-the-shoulder blind spot check that we make before moving sideways into a position where there might possibly be another vehicle.
The debate hinges on whether or not we can rely fully on what is sometimes called ‘mirror history’. The theory is that if we check our mirrors often enough, we’ll have spotted another vehicle catching us, and we’ll know that there is nothing in our blindspot.
Here’s the issue as I see it. Here’s the upside. If we DO check, and there’s something there, we can abort our manoeuvre. And if there’s nothing there, we’ve taken our eyes off the road ahead for a second or so to take the look. Does that really matter? Not unless we’re very close to the vehicle ahead, or we’re trying to squeeze the pass into the tightest possible opportunity.
But what if we’re relying on the mirrors? However often we look in the mirror it can only tell us what’s behind us, not what’s alongside in the blind spot.If we spotted something in the mirrors, then we abort the manoeuvre. But if we didn’t spot the vehicle in one or more of our mirror checks, WE DON’T KNOW IT’S THERE. Now the danger is that we commit ourselves into the overtake and put ourselves at risk.
The real problem is that we have limited attention, and the busier the road gets, the less likely we are to make our mirror checks frequent enough to fill in information about what’s catching us from behind. As one contributor put it:
“I find there are some situations where I think a shoulder check is essential and some where they aren’t needed. It all depends on the complexity of predicting the future. If you have gathered a stable but dynamic, developing ‘picture’ of the space around you from the information gathered in the period before the manouevre – other traffic, behaviour, speeds – and can confidently predict that nothing will adversely affect the manoeuvre… then you make the move without a shoulder check. If the situation is one of high complexity then you make the check.”
In essence, I agree. But given the human propensity for making mistakes, I’d have to be very, VERY certain there was nothing around me NOT to do one. Positions of vehicles change very fast and we need up-to-the-minute situational awareness, and it’s debateable whether mirrors alone can ever provide this.
Look at it this way. We wouldn’t rely on three or four glimpes of the road through a tall hedge before deciding it was safe to drive straight out of a minor road. We’d take a final look before committing ourselves. Mirror checks give us the rearward equivalent of these glimpses. Only a shoulder check can show us directly what is actually IN the blind spot.
On a single carriageway, at least we know where the danger’s coming from – behind us. But on multilane roads, it could be from either side. In the middle lane, a vehicle will come up fast on the nearside, then swoop across behind us, switching to the outside lane. There’s a significant risk that any checks in the right mirror will not have spotted this vehicle. Even if we’ve made mirror checks to the nearside, it’s unlikely we’ve spotted what’s happening unless we look at just the right moment. This can also happen as we pass the ‘on ramp’ on a motorway or dual carriageway. And drivers also move up into, then sit in the blind spot so we can’t see them either in the mirror or peripheral vision. The only way to see is via a blind spot check. In either case, all that’s needed is a quick ‘chin-to-shoulder’ glance into the blind spot before we commit ourselves.
So if looking into the blind spot can only have positive effects on our situational awareness, what’s the objection?
“It’s potentially dangerous if the car ahead suddenly slows down.”
That’s easily answered. If the car ahead slowing down instantly puts us at risk, we’re too close. No arguments. No “if’s”, “but’s” or “maybe’s”. If the car ahead slows and we are instantly put at risk, it doesn’t matter where we’re looking – it could have been in the mirror. We should have been further back, no matter we’re looking to be in the ‘overtaking’ position. If we can’t look away from the car’s brake lights, we are too close. And what’s less obvious is that if we’re in the least bit worried about running into the car ahead, we’re not going to be giving our overtaking planning full attention! It’s a form of target fixation.
“A lifesaver takes too long.”
Someone once quoted two seconds as “the time it takes to look behind”. That shows a bit of a misunderstanding about WHERE we’re looking. There’s more about this in another tip, but we’re only looking into the blind area, not ‘behind’. If we combine our final mirror check (and you ARE going to make one, aren’t you?) with the over-the-shoulder lifesaver, it doesn’t actually take all that much longer than the mirror check alone – try it.
You may see it as a ‘belt and braces’ approach, and you might argue that if we’ve got a good belt, we don’t need braces. Maybe, but belts do slip and then we might be very glad to have the braces to hold our trousers up.
One of my least favourite expressions is “if I didn’t overtake, I might as well be driving a car”, as if a motorcycle is an automatic licence to overtake.
It’s hard to Personally, I believe that there’s nothing more dangerous that we do on a bike than overtaking.
So I tend to think that everything we do that decreases risk when overtaking is a good idea. And one of those good ideas is knowing what’s behind you, which is probably the area that most riders forget to check! “After all”, they reason – “if you are overtaking you’re going faster so the hazard must be in front of you, no?”
Well, actually, no! If you’re thinking about an overtake, so will someone else be. The most obvious candidate is another bike but there are plenty of cars out there these days with stunning acceleration – ask Jeremy Clarkson!
Given the ever-more crowded state of the roads, the chances of an overtake being completely free of oncoming traffic is going down every day – you need more attention AHEAD of the vehicle you’re planning to pass and behind you too, not less by worrying about running into it.
It’s been claimed that looking behind takes too long. Some quoted two seconds
Half the reason for this argument on the issue is that many riders still think that a lifesaver is a long look behind. That was what riders were supposed to do until fairly recently, thanks to the DSA’s reluctance to acknowledge bikes had mirrors till the late 90s, but it’s really not necessary. A lifesaver is simply a chin-to-shoulder blind spot check timed before an important change of position, into a potentially dangerous position. In other words, it’s the timing rather than the action.
It’s simple enough to combine a mirror check and follow through straight into a blind spot glance. Your head check has now filled in the entire picture alongside and behind. I really cannot see why people are so against the idea of doing them. If it’s timed correctly it’s no more dangerous than looking in the mirror.
Whilst I’m on overtakes, I’ll comment on the habit of moving up to a very close “overtaking” position behind the vehicle ahead when looking for an overtake. It’s recommended by police instructors and can be seen demonstrated on the Bikesafe 2000 video. For my liking, that position is far too close – at one point on that otherwise excellent video, there is barely a single hazard line between the bike and the car ahead. Even their safer “following” position is about half the distance I’d like to keep between me and another vehicle.
So, I’d double the distances shown in that video – my following position would be around the 2 second minimum safe distance, and my closer up overtaking position around 1 second back.
Whilst it’s true that the holding a more distant 1 second “overtaking” position means you are accelerating from a greater distance, with good timing you don’t need to twist the throttle so hard because you can get something of a “run” at the overtake. Hanging back further allows you to catch up in the final part of the corner, and often makes it easier to pass without excessive speed or any wasted time. If you are too close, it’s hard to accelerate before you are wide and clear, which tends to lead to big throttle openings.
In reality, if you overtake from further back, what you have to avoid is carrying too much speed into the overtake. If a situation starts to develop that looks awkward, you may have to pull back in. If you can’t pull back in, you are passing with too much speed. You should pass slowly enough that you can bail out if you need to. I can’t begin to say how many times I’ve been in the middle of a pass and something goes wrong that I’ve had to brake to avoid, and I don’t just mean misjudgements on my part – but brain out manoeuvres by the other driver.
If you yo-yo between the close “overtaking” position and the more laid back “following” position, you need to think how incredibly distracting that can be to the driver you are trying to pass, particularly if you have lights on. And something else that’s rarely mentioned is that as soon as you move up, the car behind YOU maintains their own “is that a fly on that bike’s numberplate?” following position, so dropping back becomes problematic, if not potentially dangerous – another reason for not getting too close in the “overtaking position” and finding yourself the meat in a sandwich.
Following too close through a bend is a mistake too, as most drivers decelerate until they can see their way out of a corner – if you’re too close, that means you decelerate too and end up at lower revs than you meant to.
Slow + high gear = longer time to make the pass when you finally go.
Another factor which is frequently ignored is that cars are massively more powerful than they were even 10 years ago. Even something that looks like it ought to trundle out of a corner like a massive 4×4 can often accelerate pretty quickly. Yes bikes are faster too, so we end up using ever higher speeds to make up the pass.
Even a good overtake is potentially dangerous – so it makes sense to make them as safe as we can, not to risk all on a hurried and botched pass.
There are two problems, if you discount the obvious one of failing to look often enough. Working out speed and distance – and then deciding when that vehicle will arrive along side you. to do this
You’ll need to look into the blind spot to see the bike or car that comes up so quickly that you don’t spot it between regular checks. Do some sums. At 60mph you’re travelling around 27 metres per second. Say you check your mirrors every 5 seconds (and that’s pretty enthusiastic mirror checking, too) – in that distance you’ve travelled around 130m.
Now, what if there is a bike (or possibly even a police car) doing 120mph coming up behind you? If you check your mirrors four times at 5 second intervals, with the final check when it’s along side you, the first time you check it’ll be over 500m back – more than a quarter of a mile. There’s not that much chance you’ll spot it – think about how mirrors make things look further away!
Second check and it’s now 270m back – that’s still more than the length of two football pitches – there’s a pretty good chance you still won’t see it if there is a lot of other traffic in the lane.
Next check will be when it’s 135m behind you. Sounds easy enough to spot, but if it’s in the same lane, and there is another vehicle close behind you, will you see it? And even if you do, if you didn’t see it in either of the two earlier checks then what you don’t know is how fast it’s going.
On your fourth check, the car/bike is alongside you. Scary.
Another problem with mirror history that you may find on a
So, things can change very fast indeed on motorways. Even if you think you know what’s there and it’s going to stay there, you might be wrong. Read this:
“The dangers of the assumption above were brought home to me when I was being observed a few years ago. We were on our way back and it was getting dark; my observer was riding a Pan and another Pan had caught up with us which I hadn’t seen; this second Pan had gone past the observer who had moved over accordingly, so the lights I saw in my mirror weren’t his at all; thus there was very nearly a meeting of fairings when I pulled out to overtake, thinking that my observer had anticipated the overtake and was ready to follow me through, when, in fact, it was the “foreign” Pan overtaking me.”
So, given the safety benefits, why are some riders and instructors so dead-set against them?