Rain, snow, ice, fog and darkness all attack the same two things: how far you can see and how much grip you have. This is how to drive when one or both are missing.
About 8 minutes to read6 British Columbia questions on thisLast reviewed 2026-08-27
Worth remembering
Bad conditions cut two things: how far you can see and how much grip you have. Slow down, add space, be smooth.
Grip is a budget. Brake in a straight line, then turn; doing both at once is what puts cars off the road.
The first rain after dry weather is the slipperiest, and worn tires make hydroplaning much more likely.
Hydroplaning: ease off, hold the wheel straight, and wait for the tires to touch the road again.
Bridges, overpasses and shaded stretches ice up before the rest of the road.
Clear snow from all windows, mirrors, lights, the roof and the hood before driving.
In fog use low beams, not high beams, and never stop in a traffic lane when visibility fails.
At night, do not overdrive your headlights, and dim high beams for oncoming and leading traffic.
Two things change, and everything follows from them
Bad conditions do not invent new rules. They shrink the two resources every rule depends on: the distance you can see, and the grip between your tires and the road. Once you think of it that way, the response is always the same three moves. Slow down, leave more space in front, and make everything you do with the wheel, the brake and the accelerator smoother than usual.
Grip is a fixed budget, and steering, braking and accelerating all spend from it. On dry pavement there is enough for two at once. On snow or ice there is barely enough for one, which is why braking and turning at the same moment is what puts cars into ditches. Do your braking in a straight line, then turn. Get back on the accelerator only once the wheel is straightening.
Space is the other half. Every reason to slow down is also a reason to lengthen the gap in front of you, because stopping distances grow far more than most drivers expect once the surface is wet, snowy or icy. The counting method from the lesson on speed and following works the same way here; you just need a longer count.
Rain and standing water
The most treacherous rain is the first rain after a dry spell, when water lifts oil and rubber off the surface and makes a film slicker than the same road will be an hour later. Slow down early when the road starts to shine, and expect braking to take longer than the light rainfall suggests.
Standing water brings hydroplaning, where a wedge of water lifts the tires clear of the road and the steering suddenly goes light and vague. The response is not to brake or wrench the wheel. Ease off the accelerator, hold the wheel straight, and wait the moment out until the tires touch the road again. Worn tires and higher speed both make it far more likely, which is another argument for checking tread and slowing in the wet.
Rain also takes away vision. Use the wipers and turn your headlights on, both so you can see and so you can be seen; several provinces require headlights whenever wipers are running or whenever visibility is limited. Following a large vehicle in heavy rain puts a wall of spray on your windshield, so drop back rather than sit in it, and use the defroster when the inside of the glass starts to mist.
Snow, ice and the Canadian winter
Snow and ice are not one surface but many, and the dangerous ones are the least obvious. Black ice forms on a road that looks merely wet, most often in the early morning, in shaded stretches, and on bridges and overpasses, which lose heat from below and freeze before the road on either side of them. Packed polished snow at intersections, where hundreds of vehicles have braked and pulled away, is another place to expect no grip at exactly the moment you need it.
Drive winter roads with gentleness as the main technique: gentle on the accelerator so the wheels do not spin, early and light on the brakes, and no sudden steering. Look much further ahead than usual so that you can slow gradually rather than braking late. Leave far more room in front, because on ice the stopping distance can be many times what it is on dry pavement.
Prepare the vehicle as well as the driving. Clear snow and ice from every window, the mirrors, the lights, the roof and the hood before you set off, because snow blowing off a roof blinds the driver behind and can be an offence. Keep the washer bottle full with winter fluid, watch the fuel level, and carry a scraper, a brush, a shovel, a blanket and warm clothing. Some provinces require winter tires for part of the year, and some require them on certain highways in a defined season, so check the requirement and the dates for the province you drive in.
A rain soaked road at night. Stopping distance and sight lines both change here, and the correct answer changes with them.
Fog, whiteouts and glare
In fog, use low beam headlights. High beams bounce off the droplets and throw the light straight back at you, making things worse. Slow to a speed that lets you stop inside the distance you can actually see, use the wipers and defroster because fog wets the glass, and if you have fog lamps use them with the low beams.
If fog or blowing snow becomes too thick to continue, do not stop in a traffic lane. Take an exit or a side road, or pull well off the road, then turn on your hazard lights so nobody follows your tail lights into the back of you. A whiteout on an open prairie highway can drop visibility to nothing in seconds, and drivers who stop on the road in one are the reason those crashes involve so many vehicles.
Glare is the opposite problem and just as blinding. A low sun in the morning or the late afternoon, especially on a dirty or streaked windshield, can hide a pedestrian completely. Keep the glass clean inside and out, use the visor, wear sunglasses in daylight, and slow down when you cannot see. Sun low in the sky also hits the driver coming the other way, so assume they cannot see you either.
Driving at night
The main danger after dark is overdriving your headlights: travelling at a speed that would take you further to stop than the distance your lights actually reach. Low beams show only a short stretch of road, which is why a familiar road at night still deserves less speed than the same road in daylight.
Use high beams on open roads where there is no other traffic, and dim them when a vehicle approaches or when you come up behind one, since a mirror full of your high beams blinds the driver in front. If an oncoming driver leaves theirs on, do not stare into them and do not retaliate. Look toward the right edge of your lane and use the line at the edge of the road to steer by until they pass.
Night brings other changes too. Depth and speed are harder to judge, tired drivers are on the road, animals move at dawn and dusk and freeze in headlights, and pedestrians and cyclists in dark clothing appear far later than you expect. Keep your headlights, tail lights and windows clean, dim the dashboard so your eyes stay adjusted to the dark, and take breaks on a long night drive, because fatigue and darkness together are a great deal worse than either alone.
What British Columbia does differently
Everything above holds across Canada. This part does not, and it is the part a British Columbia examiner can ask about.
British Columbia rule
Winter tires, chains and mountain grades
British Columbia designates highways where winter tires or chains are required through the winter months. The requirement is posted on signs at the start of each designated route, the dates are set in regulation and published by the province, and enforcement is real: vehicles do get turned back at the bottom of a pass. A tire counts if it carries a recognised winter marking, either the mountain and snowflake symbol or the mud and snow marking, and the tread has to be deeper than the legal minimum. The province publishes both the accepted markings and that minimum depth.
Long descents are the other thing the interior teaches. Brakes fade when they are held on for minutes at a time, and fading brakes let you down at the bottom of the hill where you need them most. Gear down before the descent so the engine holds the speed, and use the brakes in firm short applications rather than constant pressure. Runaway lanes exist on the steepest grades for vehicles whose drivers got this wrong. On a slow climb, use the pull outs so the traffic behind you can pass in one clean move rather than in a string of risky ones.
Black ice sits on shaded curves and on bridge decks after a clear cold night, and it looks like plain wet asphalt. Fog fills the valleys in the morning. Snow and rockfall close passes with little notice, so check the provincial highway conditions service before a mountain trip and treat a closure as final. Wildlife on the road at dawn and dusk is an ordinary hazard here rather than a postcard.
Where people get this wrong
What people think
Four wheel drive means I can stop and turn like it is summer.
What is actually true
It helps you get moving on a slippery surface and does nothing for stopping or steering, because those depend on the same four tire contact patches every other car has. Confidence from all wheel traction is why some of these vehicles end up in the ditch first.
What people think
High beams help me see in fog.
What is actually true
The light reflects back off the water in the air and reduces what you can see. Low beams sit lower and throw less of it back, which is why they are the correct choice.
What people think
Clearing a patch of the windshield is enough to set off.
What is actually true
You need all the glass, the mirrors and the lights, and the roof and hood cleared as well. Snow sliding off a roof blinds the driver behind you and can be an offence.
What people think
The road just looks wet, so it is fine.
What is actually true
That is exactly what black ice looks like, and it forms first on bridges, overpasses and shaded stretches. If the temperature is near freezing, treat shiny pavement as ice.
What people think
If a whiteout hits, the safest thing is to stop where I am.
What is actually true
Stopping in a traffic lane in poor visibility is how multi vehicle pile ups start. Get right off the road if you can, turn on the hazard lights, and wait there.
Check yourself
Three questions from the British Columbia bank on weather and night driving. Answer them in your head first, then open the answer to see the rule it comes from.
Weather and night driving1 of 3
You are planning a drive over a mountain highway in midwinter, and a sign where the route begins shows a winter tire requirement.
AAll season tires are always enough as long as the tread is good
BYou need tires carrying the mountain and snowflake symbol, or at least the mud and snow marking, in good condition, or approved chains
CTwo winter tires on the drive wheels will do
DThe requirement only bites while snow is actually falling
Show the answer
The answer is B. You need tires carrying the mountain and snowflake symbol, or at least the mud and snow marking, in good condition, or approved chains
Designated highways carry a winter tire or chain requirement through the winter months, and the dates are posted on signs at the start of the route. Tires marked with the mountain and snowflake symbol use rubber that stays soft in the cold, and that is where the grip comes from. Fitting them on two wheels only leaves the other end of the car with far less grip and makes a spin more likely.
Motor Vehicle Act (British Columbia)
Weather and night driving2 of 3
You are at the top of a long steep descent in a heavily loaded vehicle.
ACoast down in neutral to save fuel
BHold light pressure on the brakes the whole way down to keep a steady speed
CBuild speed at the top so you have something to lose later
DShift down before you start down and let the engine hold your speed, using the brakes in firm short applications
Show the answer
The answer is D. Shift down before you start down and let the engine hold your speed, using the brakes in firm short applications
Brakes turn speed into heat, and a long descent gives them nowhere to shed it, so held brakes fade until the pedal does almost nothing. A lower gear makes the engine do most of the work and keeps the brakes cool for when you really need them. Choose the gear at the top, because shifting down is much harder once the speed is up.
Motor Vehicle Act (British Columbia)
Weather and night driving3 of 3
On a cold clear morning the road looks wet in the shade under a bridge, and as you reach it the steering suddenly feels light.
AEase off the accelerator, keep the steering straight, and stay off the brakes until you feel grip return
BBrake firmly to slow down before the patch ends
CSteer quickly from side to side to find grip
DAccelerate to get across it faster
Show the answer
The answer is A. Ease off the accelerator, keep the steering straight, and stay off the brakes until you feel grip return
What looks like a wet patch on a freezing morning is often a thin sheet of ice, and it forms first on bridges, overpasses and shaded corners because they lose heat from both sides. Any sudden input while you are on it breaks what little grip is left. Do your slowing before you reach patches like that, not on them.
Motor Vehicle Act (British Columbia)
Now go and answer some questions
The British Columbia bank holds 6 questions on weather and night driving. Answering them now, while the lesson is fresh, is how you find the parts that only felt clear.
