Teorio
Driving in darkness and on slippery roads
Driving in darkness and on slippery road surfaces is about how you adjust speed, distance and lighting to maintain visibility and control. The topic is important because both reduced visibility and poor road grip greatly increase the risk of accidents in Sweden, especially during the autumn and winter months.
Rules & Regulations
- The driver shall adapt speed to visibility, weather and road conditions so that the vehicle can be controlled and stopped within a safe braking distance.
- Headlights (at least low beam) must be used from dusk to dawn and in other conditions of reduced visibility; the lights must not be used so that other road users are dazzled.
- High beam may be used when it improves visibility without dazzling oncoming or preceding vehicles; when meeting oncoming traffic or when following another vehicle you shall switch down to low beam.
- On slippery roads the driver shall increase the following distance and choose a speed that keeps the vehicle stable; heavy braking and sudden steering movements are inappropriate.
- It is the driver's responsibility to reduce speed in good time before places where slipperiness can be expected (for example bridges, shaded sections and hill crests) to avoid sudden maneuvers.
- Equipment that affects visibility (e.g., defective headlights or dirty glass) shall be fixed before driving in the dark because correct lighting is a prerequisite for safe driving.
Tips for Drivers
- Check the function and alignment of the headlights and clean them before night driving — misaligned or dirty lights severely reduce visibility.
- Allow extra time and choose well-lit roads or routes you know well when the road is slippery and it is dark — this reduces stress and the need for quick decisions.
- Reduce speed early and steadily before bends, hill crests and bridges where ice often appears first; avoid hard braking if you feel the car losing grip.
- Keep a greater distance than usual and drive smoothly with steering, throttle and brakes to avoid the vehicle losing traction on slippery surfaces.
Common Mistakes
- Using high beam for too long on country roads and dazzling oncoming drivers instead of switching to low beam in good time.
- Underestimating the risk of black ice — many drive at normal speed even though the road surface may be very slippery without visible signs.
- Keeping too short a following distance in darkness or on slippery roads because it is harder to judge stopping distance and reaction time.
Exam Tip
On the theory test a common trap can be to state exact meter or second intervals for braking/safety distances in different conditions. The answer often expected is that you should always adapt speed and distance to visibility and road grip rather than fixed numbers.
Did You Know?
Night driving affects the visual field and depth perception — even an experienced driver has significantly less time to detect hazards and react when it is dark compared with daylight.
Frequently Asked Questions
When should I switch from high beam to low beam?
You should switch to low beam when oncoming vehicles approach or when you are close behind another vehicle so as not to dazzle other road users. Switch in good time so the other party is not temporarily dazzled.
How do I drive safely on black ice?
Reduce speed well in advance, keep the steering wheel straight and avoid sharp braking or steering changes. If the car starts to skid, steer gently in the direction of the skid and allow the car to regain grip before you correct.
Can I use fog lights in all situations?
Fog lights (front and/or rear) are intended for severely reduced visibility such as dense fog or heavy snowfall. Use them only when visibility is so poor that normal lighting is insufficient, because rear fog lights can dazzle or confuse drivers behind.
How much greater following distance should I keep in the dark or on slippery roads?
There are no fixed figures that fit all situations; the principle is to increase the distance enough that you can safely stop or avoid hazards given the visibility and road grip. Be generous with space when you are unsure.
Practice more in the app
Study Swedish road signs and driving theory in English. 314 signs with rules, tips and quizzes.