What Changes in the Dark

At night, you can’t see as far ahead, and it becomes harder to judge colour, detail and distance. Reduced light also makes hazards at the edges of your vision more difficult to detect. Pedestrians, cyclists and other road users are harder to see, and you are harder for them to see.

The practical effect is less warning and less time to react. The answer isn’t to drive nervously. It’s to adjust your speed, increase your awareness and leave yourself enough room to respond.

Don’t Overdrive Your Headlights

You are overdriving your headlights when you’re travelling so fast that your stopping distance is longer than the distance you can clearly see ahead. Ontario’s driver’s handbook identifies this as a night-driving hazard, and the principle applies across Canada.

Reflective road signs can create a false sense of visibility. They may reflect your headlights from a considerable distance, making it appear that you can see farther than you actually can. The road surface, obstacles and hazards may only become visible much closer to your vehicle.

On unlit rural roads, around curves and approaching hill crests, reduce your speed early. Don’t wait until a hazard appears in your headlights to react.

For more on the relationship between speed, reaction time and stopping distance, see our guide to following distance.

Headlights, Low Beams and High Beams

Turn your headlights on before it becomes difficult to see, not after darkness has settled in. Daytime running lights are not a substitute for full headlights because they may not activate your tail lights. Parking lights are intended for a parked vehicle, not normal driving.

If your vehicle has automatic headlights, check that they are actually activated. Some systems may not respond appropriately to every poor-light condition.

Provinces set their own exact headlight requirements and distances. In Ontario, for example, the Highway Traffic Act requires headlights from half an hour before sunset until half an hour after sunrise. Ontario’s driver’s handbook also specifies low beams within 150 metres of an approaching vehicle and within 60 metres of a vehicle you are following. Check your provincial or territorial driver’s guide for the requirements where you live.

Our bad weather driving guide explains headlight use in fog, rain and snow in more detail.

Handling Glare

Oncoming headlights can temporarily interfere with your vision. The natural instinct is to look directly at the lights, but doing so makes the problem worse. Instead:

• Look toward the right edge line of your lane rather than directly into the headlights.
• Maintain awareness of your lane position and the road ahead.
• Reduce speed if visibility is affected.
• Use the day-night setting on your rear-view mirror to reduce glare from vehicles behind.
• Keep the inside and outside of your windshield clean. A film of dirt or grease scatters light and makes glare worse.

If another driver forgets to dim their headlights, don’t respond with your own high beams. Two dazzled drivers help nobody.

What’s Harder to See

Some hazards are particularly difficult to identify at night:

• Pedestrians: especially those wearing dark clothing or crossing outside well-lit areas
• Cyclists: particularly those without lights or reflectors
• Stopped or slow vehicles: these can be difficult to recognize on unlit roads
• Animals: wildlife may approach or cross rural roads, particularly around dusk and dawn
• Debris and potholes: your headlights may reveal these hazards only when you are relatively close

Scan farther ahead when possible, but don’t focus on one point. Check the road edges, intersections, driveways and areas where hazards may emerge. The techniques in our intersection scanning guide apply at night as well. Allow more time to identify potential hazards and adjust your speed when visibility is limited.

Fatigue at Night

Driving after dark can coincide with your body’s natural sleep period, making fatigue an important safety concern. Warning signs include:

• Frequent yawning
• Heavy or drooping eyelids
• Difficulty maintaining a steady lane position
• Missing a turn or road sign
• Slower reactions
• Not remembering the last few kilometres of driving

Transport Canada’s collision statistics identify fatigue as a contributing factor in about 3% of fatal collisions. Police-reported figures may understate its role because fatigue can be difficult to establish after a collision. See our guide to leading contributing factors in Canadian crashes for the wider picture.

Before You Go

A few simple checks can improve visibility and reduce distractions:

• Make sure all headlights, tail lights and signal lights work.
• Clean your headlights, mirrors and windshield, inside and out. A film on the inside of the glass increases glare.
• Plan your route, especially if it includes unfamiliar or unlit roads.
• Allow extra travel time so you aren’t tempted to drive faster than conditions permit.
• Avoid beginning a long night drive when already tired.

Common Mistakes

Overdriving your headlights

The problem: The road feels empty, so you increase your speed beyond what your headlights allow.

Better approach: Keep your speed low enough to stop within the distance you can clearly see.

Leaving high beams on

The problem: You dazzle oncoming drivers or the driver ahead.

Better approach: Dim your lights in good time and use high beams again only when the road is clear.

Relying on daytime running lights

The problem: Your tail lights may not be illuminated, making your vehicle harder to see from behind.

Better approach: Turn on your full headlights at dusk and whenever visibility is reduced.

Staring into oncoming lights

The problem: Glare interferes with your vision and can cause you to drift from your lane.

Better approach: Look toward the right edge line while maintaining awareness of your lane position.

Driving tired

The problem: You keep going because your destination is close.

Better approach: Stop somewhere safe and rest before continuing.

Practice Exercise: The Stopping Check

Build night-driving experience gradually. Start at dusk, progress to quiet, well-lit streets after dark, and move to unlit roads as your skills and confidence develop. Each of you has a job.

Your job

During the drive, identify a visible object ahead, such as a road sign or parked vehicle, and consider whether you could stop before reaching it at your current speed. If the answer is no, ease off the accelerator and reassess your speed. Practise switching between high and low beams in good time, and use the right edge line as a reference when approaching oncoming glare. Keep your attention on driving rather than repeatedly looking for objects or performing calculations.

Your supervising driver’s job

Your supervising driver asks you to explain how you’re judging your speed in relation to visibility, and discusses your answer when road and traffic conditions allow. They watch whether you:

• Reduce speed early on unlit roads
• Dim your high beams in good time
• Keep your lane position when facing glare
• Recognize hazards near the road edges

Supervisors can find advice on calm, constructive feedback in our guide to teaching a new driver.

The Bottom Line

Night driving gives you less time to recognize and respond to hazards. Keep your speed within the distance you can see, use your headlights correctly, manage glare without losing lane position, and take fatigue seriously. Check your provincial or territorial driver’s guide for the exact headlight requirements where you live.

At night, you should always be able to stop within the distance you can clearly see ahead.