Dazzled on a wet bend: cyclist, tractor and limited seeing distance
At 22:30 you are driving a laden 7.5-tonne box truck on an unlit regional road. The limit is 80 km/h and you are doing 75 km/h. It has been raining; the surface is wet and there are fallen leaves. As you enter a right-hand bend, the dipped headlights of an oncoming SUV flare across your windscreen and you are dazzled. Your seeing distance drops to about 30 m. Beyond the bend, a cyclist in dark clothing with no rear light is riding in your lane, and a tractor with a wide trailer is partly on the grass verge on the opposite side. Your load is 3 t of packaged goods and is secured. Your brakes and tyres are in good condition. There is no street lighting and no footpath. You have driven this road before, but not at night in rain.
1. What should you do as you enter the bend, and what speed is appropriate? Explain using stopping distance and visibility.
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75 km/h is too fast for the conditions. You should slow down before the bend, not in it, and choose a speed from which you can stop within the distance you can see to be clear - about 30 m here.
At 75 km/h you travel about 21 m every second before you even apply the brakes. On a wet road with leaves, braking distance is longer than on dry tarmac. Your total stopping distance will be well beyond 30 m, so the current speed leaves no safety margin. Ease off early, use gentle braking, keep dipped headlights on and avoid staring at the oncoming lights; look towards the left edge of your lane to hold your position. Be prepared to stop if the cyclist, the tractor or an unseen hazard blocks your path.
2. How should you deal with the cyclist? Include passing clearance and the effect of the oncoming vehicle.
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Treat the cyclist as a vulnerable road user who is hard to see: dark clothing, no rear light, wet road and a bend. You must be able to stop behind the cyclist if necessary. Do not overtake simply because you have driven the road before.
In Ireland, the recommended safe passing distance is about 1 m at speeds up to 50 km/h and about 1.5 m at higher speeds. At night in rain, you should allow more space and be aware that the cyclist may swerve around a drain or leaf patch. The oncoming SUV and the tractor partly on the verge reduce the room available. Hold back until the oncoming vehicle has passed and you can give the cyclist adequate clearance without crossing into the tractor’s path. If you cannot do that, wait behind the cyclist.
3. What do the wet leaves and the laden truck do to your braking, and how should you adjust your driving plan?
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Wet leaves can act like a slippery layer and reduce tyre grip, especially under braking or steering. A laden 7.5-tonne truck also carries more momentum than a car, so it needs more distance to stop. Good brakes and tyres help, but they cannot overcome low grip.
Plan ahead: reduce speed before the hazard, leave a larger gap, avoid sudden braking or steering, and use gentle, progressive inputs. Do not rely on engine braking alone on a slippery bend. Keep the vehicle stable and be ready to stop for the cyclist or the tractor. After the bend, do not accelerate hard until you are sure the road is clear and the surface is consistent.