Winter driving tips for truck drivers: slow down before the slide
On snow and ice, a truck's problem is traction, not horsepower. Every winter crash that could have been avoided was decided earlier: by the speed, the space, and the condition of the truck before the tires let go.
Written by Rigo Diaz
Winter driving in numbers
The winter driving tips that matter most for truck drivers: get the truck ready before the storm, cut your speed by half or more on packed snow and to a crawl on ice, keep a much longer following distance, turn off the engine brake, steer and brake gently, and park when traction is gone.
Snow and ice don't change the rules of driving a truck. They shrink the margin for every mistake: a little too fast, a little too close, a brake applied a little too hard, and a loaded rig that would have stopped on dry pavement slides instead.
I spent more than six years in risk management before I founded Simplex, and I have led the company for more than 25 years since. This guide covers what changes on a winter road, how to prepare the truck, how to drive and recover from a skid, the state rules that can stop you, and what a winter crash does to a carrier's record. For downgrades and Colorado's chain law, see our mountain driving guide.
The full briefing, read aloud
8 chapters. Select one to jump to it.
Generated with AI text-to-speech from this article's key insights, in order, rather than reading it word for word. Chapter times come from a transcript of the audio. The article itself was written and reviewed by Rigo Diaz.
Key takeaways
Slow down by the surface, not the sign
The CDL handbook says cut speed by about a third on wet roads, by half or more on packed snow, and to a crawl on ice.
Below freezing and wet-looking means black ice
Bridges freeze first, shaded spots stay icy, and a road with no spray coming off other tires has likely frozen.
Engine brake off on slick roads
Engine brakes and retarders slow only the drive wheels and can make them skid, which in a tractor-trailer can start a jackknife.
Snow on the trailer roof is a legal problem
New Jersey and Pennsylvania require drivers to clear accumulated snow and ice, with fines up to $1,500 when it falls and hurts someone.
Parking is a federal requirement, not a weakness
49 CFR 392.14 requires you to stop driving when conditions become too dangerous, and no carrier may coerce you to keep going.
In this articleContents
Why are snow and ice harder on a truck?
Because you can't steer or brake without traction, and snow and ice take most of it away. On dry pavement with good brakes, a truck at 55 mph needs at least 419 feet to stop, perception and reaction included. On a wet road, stopping distance can double.
The CDL handbook gives a simple rule for matching speed to the surface (we used California's edition, DL 650):
| Surface | How much to slow down | Example from 55 mph |
|---|---|---|
| Wet | By about one third | About 35 mph |
| Packed snow | By half or more | About 27 mph or less |
| Ice | To a crawl, then stop as soon as it is safe | Find a safe place to park |
Weight cuts both ways. An empty or lightly loaded truck has less traction and needs more distance to stop than a loaded one, and a light trailer is the one most likely to swing out. That's why Pennsylvania, as you'll see below, restricts light trailers first in a storm.
The stakes are real. Federal Highway Administration figures for 2019 to 2023 average about 186,000 crashes a year on snowy or slushy pavement and 156,000 on icy pavement, with more than 1,000 people killed. And federal rules already require you to drive this way: 49 CFR 392.14 calls for extreme caution and reduced speed when snow, ice, or sleet affect visibility or traction.
How do you get a truck ready for winter driving?
Do your normal inspection and give extra attention to the parts winter attacks. The CDL handbook's winter checklist:
- Coolant and antifreeze. A full system with enough antifreeze to protect against freezing, checked with a coolant tester.
- Defrosters and heaters. Working defrosters, plus any mirror, battery box, or fuel tank heaters you rely on.
- Wipers and washer fluid. Blades that press hard enough to sweep snow, and washer antifreeze in the reservoir.
- Tires. At least 4/32 inch of tread on steer tires and 2/32 inch on the rest (49 CFR 393.75). The legal minimum is not much traction, so more is better in winter.
- Chains. The right number for your drive tires, extra cross-links, no broken hooks or side chains, and practice putting them on before you need to.
- Lights, windows, mirrors, steps. Clean lights and reflectors, clear glass, and no ice on hand holds, steps, or deck plates.
- Radiator shutters and winterfront. Shutters free of ice and a winterfront not closed too tightly, or the engine can overheat.
- Exhaust. No leaks. With the windows up, carbon monoxide can make you drowsy or kill you, and 49 CFR 392.66 bars driving a truck where it has been detected.
Air brakes need cold-weather care too. Water in the air tanks can freeze and cause brake failure, so drain manual tanks at the end of every driving day, and top off the alcohol evaporator daily if your system has one. Don't set the parking brakes when the brakes are very wet in freezing temperatures, because they can freeze in place. Chock the wheels instead, or dry the brakes by braking lightly in a low gear first.
Then pack for being stuck: our truck driver gear checklist covers winter clothing, food, water, and a roadside kit.
Do you have to clear snow off a trailer roof?
In some states, yes, and the fines are aimed at trucks. A sheet of ice coming off a trailer at highway speed can go through another driver's windshield.
- New Jersey (N.J.S.A. 39:4-77.1) requires reasonable efforts to clear snow and ice before driving, including the cab, the top of a trailer, and the top of an intermodal container: $25 to $75 per offense, even if nothing falls. If snow or ice from a commercial vehicle hits a person or vehicle and causes injury or damage, the fine is $500 to $1,500. A truck driver headed to snow removal equipment isn't fined, unless they already passed some, and an officer can check your logs or map to see.
- Pennsylvania (75 Pa.C.S. 3721) requires reasonable efforts to remove accumulated snow and ice, roof included, within 24 hours after it stops falling: a $50 fine per offense. Snow or ice that falls and causes death or serious injury carries $200 to $1,500. Truck drivers on the way to a removal facility are exempt, as are drivers for whom clearing it would break a workplace safety rule or threaten their own safety.
New Jersey adds a twist carriers should know: whoever had the trailer when the snow piled up, which can be the shipper or consignee, is responsible for clearing it. Plan where your drivers can clear trailers safely. Nobody should be climbing onto an icy trailer roof.
How should a truck driver drive on snow and ice?
Slowly and smoothly, with everything done early. If it is very slippery, the handbook's advice is not to drive at all: stop at the first safe place.
How do you spot black ice?
Black ice is a thin, clear layer that lets you see the pavement through it, so the road just looks wet. Any time the temperature is below freezing and the road looks wet, assume it is ice. Other warning signs:
- Bridges and overpasses freeze before the road does, especially near 32°F.
- Shaded stretches stay icy long after open road has melted.
- No spray coming off other vehicles' tires means the water on the road has frozen.
- Ice on your mirror, mirror support, or wipers. Open the window and feel the front of the mirror. If it is icing, the road is probably icing too.
- A thaw. Slightly melting ice is wet ice, and wet ice is more slippery than dry ice. Slow down more as temperatures climb toward freezing.
How should you steer, brake, and space on a slick road?
- Start gently and get the feel of the road before you build speed.
- Turn off the engine brake or retarder. It brakes only the drive wheels and can make them skid.
- Brake and turn gently. No harder than needed, and never brake in a curve. Take curves slower.
- Hold a steady speed. Look far enough ahead to avoid slowing down and speeding up, and don't pass slower vehicles unless you must.
- Add space. The dry-road minimum is 1 second per 10 feet of vehicle length, plus 1 second over 40 mph: 7 seconds for a 60-foot rig. On a slick road you need far more. Don't drive alongside other vehicles.
- Stop early for trouble. When traffic jams up ahead, slow down or stop and wait for it to clear, and give snowplows and salt and sand trucks plenty of room.
Blowing snow is a visibility problem as much as a traction one: drive slowly enough to stop within the distance you can see. Our fog driving guide covers speed by sight distance and which lights to use.
What should you do if your truck starts to skid?
Take away whatever caused it: release the brake or the throttle, and steer to keep the rig straight. Skids come from braking too hard, steering too sharply, accelerating too hard, or, most often, driving too fast for the road.
| Skid | What it looks like | What to do |
|---|---|---|
| Drive wheels spin (acceleration) | Rear of the tractor slides, usually on ice or snow | Ease off the throttle; push in the clutch if it is very slippery |
| Drive wheels lock (braking) | Tractor slides sideways and the trailer pushes it into a jackknife | Stop braking, then countersteer quickly as the tractor comes back in line |
| Front wheels slide | Truck keeps going straight however you turn the wheel | Stop turning and braking so hard, and let the truck slow down |
| Trailer wheels lock | Trailer swings out of your lane in the mirror | Release the brakes; never use the trailer hand brake to straighten out |
Check your mirrors whenever you brake hard. The mirror is the earliest place to see a trailer skid, and once the trailer leaves your lane a jackknife is hard to prevent. Empty and lightly loaded trailers are the most likely to swing.
When do chain laws and storm restrictions apply to trucks?
There is no federal chain law. States set their own, and the rules for heavy trucks are stricter than for cars. Three western states show the range:
| State | Which trucks | When chains are required |
|---|---|---|
| California | Over 6,500 lb gross; snow tires don't exempt them | No set season: chains go on when signs require them, usually with about a mile to the checkpoint |
| Washington | Over 10,000 lb GVW, plus at least 2 extra chains | Carried November 1 to April 1 on listed routes such as I-90 between North Bend and Ellensburg; at other times when posted |
| Oregon | Over 10,000 lb GVW; traction tires don't substitute | Carried when conditions may require them and Snow Zone signs are posted; used when signs say so |
Caltrans sets a 25 or 30 mph limit while chains are required and can keep any vehicle out of a chain control area. Oregon DOT says the legislature raised the fine for trucks that fail to chain up to $880 in 2021. Colorado's Must Carry corridors, season, and fines are in our mountain driving guide.
Eastern states tend to restrict trucks rather than require chains. In a January 26, 2026 storm, PennDOT's tiered restrictions barred empty or lightly loaded tractor-trailers and box trucks from several interstates, let loaded single trailers through only with chains or approved traction devices, closed I-84 to all commercial vehicles, and cut speed limits to 45 mph. Check restrictions for every state on the load before you dispatch.
When should you stop driving in winter weather?
When conditions become too dangerous to continue, federal law requires you to stop until the truck can be operated safely (49 CFR 392.14). No carrier, shipper, receiver, or broker may coerce a driver to violate that rule (49 CFR 390.6).
Get completely off the road if you can. If you must stop on a shoulder, turn on your flashers right away and set out your warning devices within 10 minutes (49 CFR 392.22). A storm you didn't see coming can allow up to 2 extra hours of driving to reach a safe place, but a storm in that morning's forecast doesn't qualify; the mountain guide explains that exception.
What does a winter crash cost a carrier?
More than the truck. A crash that kills someone, sends someone for treatment away from the scene, or leaves a vehicle towed away with disabling damage is an accident under federal rules (49 CFR 390.5T), and it can count in your Crash Indicator BASIC.
Ice is not an excuse FMCSA recognizes. Its Crash Preventability Determination Program reviews 21 crash types, such as being rear-ended or struck by another motorist who lost control. A truck that slides off the road on its own isn't one of them. The exception is any crash where video shows the sequence of events, which makes a forward-facing camera worth having before winter. Crashes found not preventable come out of the Crash Indicator BASIC but stay listed.
What a carrier can do:
- Dispatch with the weather. Build time for slow roads and chain-ups into the load, and back the driver who parks.
- Put chains on every truck routed through chain states, and make sure drivers have practiced with them.
- Train skid recovery and winter checks before the season, not after the first slide-off.
- Treat every winter crash with the same routine: our truck accident procedures cover the scene and testing deadlines, and our loss-prevention routine covers preventability requests and coaching.
Physical damage insurance can pay to repair or replace your own truck after a covered collision. It can't take a crash off your safety record.
How Simplex helps you get through winter
Winter safety comes from trained drivers, maintained trucks, a clean crash record, and coverage that fits your routes. We help with each.
Driver performance and training
Through our CSA program, our team monitors your drivers' performance and designs the policies and training your operation needs.
Crash records and DataQs
Our compliance programs include an accident registry, driver trainings, and, from the Essentials Program up, DataQs requests and maintenance records.
Coverage for your own trucks
Physical damage insurance pays to repair or replace your trucks and trailers after a collision or other covered loss.
Frequently asked questions
How much should a truck slow down on snow and ice?+
Should you use the engine brake on snow or ice?+
How do truck drivers spot black ice?+
Do truckers have to clear snow off the trailer roof?+
Does bad weather give truck drivers more driving hours?+
Where this information comes from
The techniques and rules below come from the CDL handbook, federal regulation, FHWA, FMCSA, and state transportation agencies and statutes, checked on October 21, 2026.
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1
California DMV — California Commercial Driver Handbook (DL 650)
Stopping distance, speed by road surface, slippery-surface signs, winter vehicle checks, air tank drains, and skid recovery.
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2
eCFR — 49 CFR Part 392
Hazardous conditions (392.14), warning devices for stopped trucks (392.22), and carbon monoxide (392.66).
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3
FHWA — How Do Weather Events Affect Roads?
Crashes, injuries, and deaths on snowy, slushy, and icy pavement, 2019-2023 averages.
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4
FMCSA — Crash Preventability Determination Program
The 21 eligible crash types, the video exception, and how not-preventable crashes are treated in SMS.
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5
New Jersey Legislature — P.L. 2009, c.138 (N.J.S.A. 39:4-77.1)
Duty to clear snow and ice from cabs, trailers, and containers; fines; the commercial vehicle exception.
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6
Pennsylvania General Assembly — 75 Pa.C.S. 3721
Snow and ice removal within 24 hours, the $50 and $200-$1,500 fines, and motor carrier exceptions.
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7
Caltrans — Truck Chain Requirements
No set chain season, the 6,500-pound threshold, and where chains are most often required.
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8
WSDOT — Chain requirements for vehicles over 10,000 pounds
The November 1 to April 1 carry rule, extra chains, and the routes it covers.
Written by
Rigo Diaz
Founder & CEO, Simplex Group
Founder and CEO of Simplex Group, with more than 25 years leading the company and helping trucking entrepreneurs navigate compliance, insurance, and the day-to-day demands of running a carrier. Before founding Simplex, he spent more than six years in risk management, experience that continues to shape how he approaches insurance, compliance, and carrier risk today.
Published · Updated
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Winter crashes are decided before the tires let go
A ready truck, a speed that fits the surface, space to stop, and a driver free to park. Get those right and a winter road stays an ordinary day's work.
If you want help building winter training, maintenance routines, and coverage around your operation, talk to our team.