Do not live in the space beside a car's rear door, and do not follow closer than the distance in which you could stop if the vehicle ahead stopped instantly. Those two rules cover the overwhelming majority of the space-management problem on a motorcycle. The first keeps a driver's lane change from arriving on top of you. The second means the driver behind you is not the only thing standing between you and the back of a lorry.
The Highway Code's general rules for all drivers and riders put the following-distance principle plainly in Rule 126: drive at a speed that lets you stop well within the distance you can see to be clear, leave enough space to pull up safely if the vehicle in front suddenly slows or stops, allow at least a two second gap on high-speed roads and in tunnels where visibility is reduced, at least double it on wet roads and up to ten times greater on icy roads, and remember that large vehicles and motorcycles need a greater distance to stop.
Where the blind areas actually are
A car's blind areas sit roughly rearward and outward of each rear door pillar, in a wedge that widens with distance. They are not fixed: seat position, mirror adjustment, headrests, passengers, luggage and window tint all move them, and they are considerably larger on vans, pickups and anything with a solid bulkhead. On an articulated lorry, the blind areas are large enough that a motorcycle can be lost entirely along the whole nearside.
Three practical consequences follow.
- Pass through, do not sit in. If you must occupy the wedge, occupy it briefly. Riding at the same speed as a car with your front wheel level with its rear door is the single most common avoidable position on a motorway.
- The test is their mirror, not yours. If you cannot see the driver's face in their door mirror, assume they cannot see you. That is a real-time check you can do at a glance rather than a rule of thumb about metres.
- Large vehicles are worse than the geometry suggests. Alongside a lorry's cab you are invisible, alongside its trailer you are invisible, and a turning trailer sweeps across your lane. The safe answer is not to be there, which sometimes means waiting.
Behind you, a motorcycle also has its own blind areas, and the mirror fitted to your bike is doing less than you think. Convex mirrors compress distance, bar-end mirrors vibrate at exactly the frequencies that matter, and a rider in a bulky jacket sees mostly their own shoulders. A lifesaver, an actual head turn, is not optional on a bike for the same reason a mirror glance is not sufficient; the observation sequence in the Highway Code's Rule 88 is observation, signal, manoeuvre, and the observation includes looking behind rather than only using mirrors.
Following distance in numbers you can use
| Condition | Minimum gap to the vehicle ahead | Why it changes |
|---|---|---|
| Dry road, high-speed roads | Two seconds, measured to a fixed point | The Highway Code minimum for high-speed roads and reduced-visibility tunnels |
| Wet road | At least four seconds, double the dry gap | The Highway Code doubles the gap; braking distances lengthen and grip is lower |
| Ice or packed snow | Up to ten times greater than the dry gap | The Highway Code multiplier for icy roads |
| Behind a large vehicle | Four seconds or more, dry | You cannot see past it, so your effective sight line is its rear doors |
| Being followed too closely | Increase your own forward gap | The extra space is what lets you brake gently instead of hard |
| Cold tyres, early in a ride | Add margin regardless of surface | Grip is below normal until the tyre reaches working temperature |
| Riding at night | Never beyond the distance your headlight actually shows clear | Rule 126 requires stopping well within the distance you can see to be clear |
Measure the two seconds properly rather than estimating it. Pick a fixed object, start counting when the vehicle ahead passes it, and you should not reach it before you finish. Almost every rider who does this for the first time discovers they were running about a second, which at motorway speed is most of a stopping distance.
The rider being followed too closely
Tailgating is the situation riders most often get wrong, because the instinctive responses are all bad. Braking to make a point puts your safety in the hands of the person you are annoyed with. Accelerating away invites them to follow at the new speed. Both leave you with the same tailgater and less margin.
The useful response is counter-intuitive: increase the gap in front of you. That extra space is what lets you decelerate gently and progressively rather than sharply, which is the only thing that gives the driver behind time to react. Then arrange to be passed, by easing off where there is room or moving over at the first opportunity, and let them go.
There is a cost, and it is worth naming. Doing this well means being passed by people who are driving badly and letting it go, repeatedly, on a machine that could easily outrun them. Riders who cannot do that tend to end up in exactly the incidents this article is about. RoSPA's Ride Safe guidance makes the same point about following distance in the other direction, noting how many rear-end collisions come from following too closely and recommending riding at a distance in which you can stop safely within the distance you can see to be clear.
Setting up so the space information reaches you
Mirrors that vibrate into a blur are not mirrors. If yours smear at cruising revs, the fixes in order of effectiveness are checking the mount for looseness, fitting mirrors with a different stem length or mass, and adding bar-end weights. Adjust them with your body in the riding position and your hands on the bars, not standing beside the bike, and set them so a slim vertical strip of your own shoulder is visible at the inner edge; that strip is your reference for how far out the rest of the view sits.
Then check the rest of the picture. Brake lights are your primary communication with the vehicle behind, and a failed bulb or an intermittent switch removes it entirely; that check belongs in the pre-ride check. Being visible in mirrors is the other half of the same problem and is covered in being seen in traffic.
Tyres decide whether the gap you chose is enough. An underinflated front changes how the bike responds to a hard stop and lengthens the distance, and the pressures that matter are the cold ones set to the manufacturer's figure, using the method in the tyre pressure guide. A Bluetooth TPMS sensor tells you about a slow leak before it becomes a braking problem rather than after.
And the gap only helps if you can use it. A full-effort stop from a two second gap is a real skill with a sequence to it, covered in emergency braking on a motorcycle, and what happens when the following driver does not stop is dealt with in what to do after a motorcycle crash.
Frequently asked questions
What following distance should a motorcyclist keep?
At least two seconds on high-speed roads, doubled to four seconds in the wet, and up to ten times that in icy conditions, per the Highway Code. Behind a large vehicle, add more, because your sight line ends at its rear doors. Measure it against a fixed point rather than estimating.
Where is a car's blind spot from a motorcycle?
Roughly rearward and outward of each rear door pillar, in a wedge that widens with distance and moves with seat and mirror position. Vans, pickups and lorries have much larger areas. The quick check is whether you can see the driver's face in their door mirror; if you cannot, assume they cannot see you.
Do motorcycles have blind spots too?
Yes, and they are larger than most riders assume. Convex mirrors compress distance, vibration blurs the image at cruising revs, and a bulky jacket obscures the inner edge of the view. A head check before any lateral movement is the standard response, and it is not replaceable by mirrors.
How do I deal with a tailgater on a motorcycle?
Increase the gap in front of you so you can slow gently instead of sharply, then arrange to be passed at the first safe opportunity. Do not brake to make a point and do not accelerate away. The goal is to remove yourself from the situation rather than to correct the driver.
Is it safe to ride alongside a lorry?
No, and it is worth treating as a rule rather than a judgement. A rider alongside a cab or trailer is outside the driver's mirror coverage for the whole length of the vehicle, and a turning trailer sweeps across your lane. Pass decisively with plenty of room, or drop back and wait.
