Patchy Fog, Main Beam and a Passenger with Chest Pain
At 23:10 on an unlit single-carriageway road with an 80 km/h limit you are driving a car with four occupants. Fog has formed in patches; visibility varies from about 60 m to 25 m. You are using dipped headlights and fog lamps. On a gentle right-hand bend, an oncoming car approaches with main beam on and does not dip. As you slow, a passenger in the rear seat says she feels chest tightness and tingling in her left arm. She has a history of angina and carries glyceryl trinitrate (GTN) spray. Ahead, at the edge of your headlights, you see a cyclist in dark clothing with no rear light, riding about 1 m from the verge. There is a solid white line on your side, a narrow grass verge, and a lay-by 40 m ahead. No traffic is behind you.
1. How do you manage lighting and speed in the fog and glare?
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Keep dipped headlights on and use fog lamps only while visibility is genuinely reduced; switch them off when conditions improve because they can dazzle. With visibility down to 25 m, the safe speed is one that lets you stop within the distance you can see - roughly 30–40 km/h, and slower on the bend. Do not look at the oncoming main beam; look to the left edge of your lane and use the verge as a guide. Do not retaliate with main beam. Keep the wipers and demister working. If the glare becomes total, slow further and be ready to stop rather than crossing the solid line.
2. What do you do about the unlit cyclist on the bend?
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The cyclist is the more immediate collision risk because the rider is unlit and close to your path. The solid white line and the bend rule out an overtake; even if the line ended, you could not see far enough ahead to pass safely. Drop back to a following distance that lets you stop if the cyclist swerves, keep dipped beam on, and do not flash or sound the horn unless the cyclist drifts into your path. The lay-by 40 m ahead gives you a place to stop for the passenger, but do not overtake the cyclist to reach it. If the cyclist waves you past, pass only when you can see clear road ahead.
3. How do you prioritise the passenger's chest pain?
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Chest tightness with tingling in the left arm in a person with angina is a possible heart attack until proven otherwise. Stop in the lay-by as soon as it is safe; do not try to drive on to hospital. Call emergency services, state “chest pain, known angina, conscious”, and keep her sitting upright and calm. Help her use her own GTN spray as prescribed. If the pain persists after a few minutes, or she becomes sweaty, pale or short of breath, do not exceed her prescribed doses; follow the emergency operator's advice. Aspirin may be advised if she is not allergic and not bleeding. Monitor breathing and be ready to start CPR.