Night Rain, Glare and People on the Road
At 8:50 p.m. you are driving from Grenville towards St George's on an unlit country road. It has been raining and the surface is wet and shiny, with mist sitting in the valleys. Ahead is a slow truck loaded with produce; you have been following it at about two seconds. A car behind you is sitting close enough that its headlights fill your mirrors. An oncoming car approaches with one headlamp on main beam and the other aimed low at the road. On your left, two people in dark clothing are walking along the edge with their backs to you. Fifty metres further on, a rum shop is lit up and several people are standing in the road outside it. You are already late for a family event and want to make up time.
1. The oncoming glare and the car behind are both affecting you. What do you change, and in what order?
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Deal with your sight first, because everything else depends on it. Slow down before doing anything else: the oncoming main beam and the wet surface together cut the distance at which you can identify a hazard, and the two walkers on your left are effectively invisible until you are almost on them. Do not stare at the oncoming lights; look towards the left edge of your lane and use the edge or centre line to hold your position. Dip your own headlights if they are on main beam, so you are not adding to the problem. Then deal with the follower: the car behind is only dangerous if you brake sharply, so open the gap to the truck to about four seconds and brake early and gently. If it still sits on your bumper, pull into a lay-by or wide verge when it is safe and let it go.
2. Why is a two-second gap wrong tonight, and what does a bigger gap buy you?
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Two seconds is the fair-weather minimum for an alert driver on a dry road. Tonight four things multiply it. Water on the road roughly doubles stopping distance. Your view past the truck is blocked, so you cannot see what it is braking for. The tailgater behind means you cannot brake hard without being hit. And mist plus glare shorten the distance at which you can identify a hazard at all. So aim for at least four seconds: pick a fixed point such as a utility pole, and count 'one thousand and one, one thousand and two...' after the truck passes it. The extra gap also lets you see round the truck's load, gives you time to react to the walkers and the rum-shop crowd, and lets you brake gently enough that the driver behind can react in time.
3. What do you do about the people on the road and the lit rum shop?
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Treat them as the highest-risk hazard on the road tonight. Pedestrians in dark clothing on a wet, unlit road may neither see nor hear you, and one may step out; the same goes for the group outside the lit rum shop, whose eyes are adapted to the shop light and who may walk into the road without looking. Ease off the accelerator, cover the brake, keep your headlights on dipped beam so you do not dazzle them, and be ready to stop within the distance you can see to be clear, which on a wet road at that speed is less than it feels. Do not use the horn as a rebuke; a short warning note is fine if someone is actually stepping out. And do not use your lateness as an excuse to overtake the truck into that crowd.