Winter mountain driving in Utah and Idaho: safety and what the auto policy does

Winter driving in the Mountain West is not one hazard but a sequence. The first storm in November catches people on summer tyres. December brings the canyon commutes to Park City, Snowbird and Brighton with chain and traction-device controls on the steep sections. January adds inversions and freezing fog along the Wasatch Front and the Snake River plain. February is black ice on bridges and shaded curves, and March is slush, potholes and the first rockfall. Idaho adds long, lightly travelled highways where a slide-off may not be found for an hour.

The auto policy is indifferent to the calendar, but the losses winter produces fall unevenly across its coverages, and two of the four states this agency serves handle injury claims in different ways. This guide covers how to drive the season, which coverage pays for each kind of winter loss, what Utah's no-fault system means at the scene, and the steps to take when something goes wrong on a mountain road.

What winter does to cars, and to the households that drive them

The typical winter losses, in roughly the order a season produces them.

• Single-vehicle slide-offs: the car leaves the road on ice, into a snowbank, a guardrail or a ditch. Often no other vehicle is involved, and the damage ranges from a tow to a total loss.
• Chain-reaction collisions: one car stops on ice and four behind it cannot. Fault is split, disputed and slow to settle.
• Snow load and falling ice from a roof, a parking structure or a plow throwing packed snow across a lane.
• Rock and debris on canyon roads after a freeze-thaw cycle, and windshield damage from gravel spread on the surface.
• Avalanche closures and control work that strand a car overnight, or bury it in a parking lot.
• Wildlife: deer and elk move to lower elevations in winter and cross highways at dusk.
• Household spillover: the driveway and the sidewalk become liability exposures on the home policy, and a snowmobile or side-by-side towed to the trailhead is on a different policy again.

Which coverage responds to which loss

A slide-off into a snowbank or a guardrail is a collision claim: collision coverage pays to repair the car less its deductible, whether or not anything else was involved. Hitting a deer is not a collision in policy terms; carriers treat animal strikes as comprehensive losses, which usually carry a lower deductible and do not count as an at-fault accident. Rockfall onto the car, a tree limb brought down by snow, a plow's snow blast that cracks the windshield, hail and flooding from a sudden melt are also comprehensive. A car buried by an avalanche in a lot is comprehensive; a car that slides into another car because of the same avalanche debris is collision.

Liability coverage pays for the other party's car and injuries when the slide is yours, and it is the coverage a mountain pile-up tests, because several claimants share one limit. Uninsured and underinsured motorist coverage pays your own injuries when the driver who hit you carries nothing or too little, which matters on a road where the other driver may be a visitor in a rental with the minimum the rental counter offered. Towing and roadside coverage, or rental reimbursement while the car is repaired, are the small endorsements that decide whether a January slide-off is an inconvenience or a month without a car.

The car and the coverage are the same across state lines, but the injury claim is not. Utah is a no-fault state: each driver's own personal injury protection pays the first layer of medical bills and lost wages regardless of who caused the crash, and a claim against the other driver for injuries is possible only above a threshold. Idaho is an at-fault state, where the driver who caused the crash, and that driver's liability coverage, pays for the injuries. A Utah driver hurt in Idaho, or the reverse, is handled under the rules where the crash happened, with the policy adjusting to meet them.

What does not respond

Liability-only auto coverage pays nothing for your own car in a slide-off. Tyres, batteries and a frozen fuel line are maintenance, not covered losses. A car that is not drivable because it is snowed in is not a claim. Damage to a snowmobile, an ATV or a trailer is on those policies, not the tow vehicle's; a trailer's liability follows the tow vehicle, but its physical damage does not unless scheduled. Personal items stolen from a car broken into at a trailhead are the renters or home policy's job, not the auto policy's. And a driver who ignores a chain control or a road closure and needs a rescue may find the carrier arguing about the recovery bill, though the crash itself is usually still a covered loss.

Before the season

Do these in October.

• Fit winter or all-weather tyres with real tread, and carry chains or approved traction devices for canyon controls; check the current requirements for the roads you use rather than relying on last year's.
• Read the declarations page: confirm collision and comprehensive are both on each car you will drive in the mountains, look at the two deductibles, and add towing and rental reimbursement if the car is one you cannot be without.
• Check the liability limits against what a multi-car pile-up could cost, and the uninsured and underinsured motorist limits against your own family's medical exposure. In Utah, confirm the personal injury protection limit; the base amount is small and can be raised.
• Build a car kit: blanket, shovel, traction mat or sand, headlamp, water, a phone charger and a printed copy of the insurance card and the roadside number.
• If you tow a snowmobile or side-by-side, confirm it is on its own policy with physical damage coverage, and that the trailer is scheduled somewhere.
• Teach any new driver in the household to recover from a skid in an empty lot before they meet ice on a canyon road.

On the road, and at the roadside

Driving on snow and ice comes down to margin: slower speeds, longer following distances, gentle inputs and braking before a curve rather than in it. Bridges, overpasses and shaded stretches freeze first and thaw last. Downhill in a low gear beats braking. If the road is closed, it is closed; an avalanche gate is not a suggestion. If conditions fall apart, the right decision is to pull off somewhere safe and wait or turn back.

After a slide-off or a crash, get the car off the travel lane if it can move, hazards on, and everyone out of the vehicle only if the roadside is safer than the car; on a busy canyon road with poor visibility, it often is not. Call for help and give a mile marker. Photograph the scene, the road surface, the other vehicles and any signage, and exchange information without assigning blame. Report the claim to your own carrier the same day whatever the fault; in Utah that starts the personal injury protection benefits, and in Idaho it puts your carrier in position to recover from the other driver. Keep the tow and recovery receipts, and ask the shop for a written estimate before authorising repairs.

A worked example

Suppose a Sandy household drives to Brighton on a Saturday in January. On the descent the car hits black ice and slides into a guardrail; nobody else is involved and nobody is hurt. The repair estimate is $8,000 and the tow from the canyon is $400. Collision coverage pays $8,000 less the $1,000 collision deductible, and the towing endorsement pays the $400 up to its limit. Without collision, the household pays $8,400 for a car that is still theirs. The figures are round and invented; the mechanism is not.

Suppose instead that the same slide pushes the car into a second car whose driver is hurt and needs $30,000 of treatment. Because the crash is in Utah, the second driver's own personal injury protection pays the first layer of that treatment, and a claim against the Sandy household's liability coverage is possible only if the injuries are serious enough to pass Utah's threshold. Had the same crash happened on a highway outside Boise, the Sandy household's liability coverage would have paid the second driver's treatment from the first dollar, and their bodily injury limit would have been the number that mattered.

The decision points

Winter changes the value of three lines on the declarations page. Collision coverage, on a car driven in the canyons, is the line that pays for the most likely loss; the choice is whether the car is worth enough to insure and how large a deductible the household can absorb in January. Liability and uninsured motorist limits are the lines a pile-up tests, and they are cheap to raise relative to what they add. In Utah, the personal injury protection limit is worth reading. If the policy already carries collision, adequate limits and a towing endorsement, the recommendation is to buy the tyres. We check the declarations page against the way you actually drive in winter and quote any change across the carriers we represent; where no change is needed, that is what we say.