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Safety & Risk

Wildlife collisions: brake, stay in your lane, then report it

A deer in the headlights takes a second. What it costs a trucking company is decided by the minutes around it: the speed the truck carried into the dark, the choice not to swerve, and the paperwork afterward.

Wildlife collisions in numbers

1–2 MLarge-animal collisions a year in the U.S.
419 ftMinimum truck stopping distance at 55 mph
10 minTo place warning devices after stopping
21Crash types FMCSA reviews, animal strikes included
Sources: FHWA Wildlife-Vehicle Collision Reduction Study; Texas DPS CDL manual; 49 CFR 392.22; FMCSA Crash Preventability Determination Program.

Most wildlife collisions happen around dawn, dusk, and into the night, and most of all in October and November. In a truck, scan far ahead, slow down enough to stop within your headlights, and if a strike can't be avoided, brake firmly in your lane instead of swerving.

An animal strike feels like bad luck, and part of it is. But much of the outcome is decided before and after the impact: how fast the truck was going on a dark rural road, whether the driver swerved, and whether anyone got a police report.

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 when animals are on the road, how to react in a truck, and what a strike does to your safety record and your coverage.

AI briefing

The full briefing, read aloud

8 chapters. Select one to jump to it.

01Decided around the impact
0:00 / 3:14

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.

Tractor-trailer with headlights on approaching two deer standing at the edge of a rural highway at dusk
Deer at the roadside at dusk in the fall puts the peak hours and the peak season in the same frame.
The Short Version

Key takeaways

Dawn, dusk, and fall are the peak

FHWA found collisions with large animals peak from 5 to 8 a.m. and 4 p.m. to midnight, and in October and November.

Don't out-drive your headlights

A truck at 55 mph needs at least 419 feet to stop. Low beams light about 250 feet ahead.

Brake, don't swerve

A sharp turn can skid or roll a truck, especially a top-heavy one or a combination with multiple trailers.

Not every deer strike is a DOT crash

It counts only with a fatality, an injury treated away from the scene, or a tow for disabling damage.

A recordable strike can be reviewed

Striking an animal is eligible for FMCSA's not-preventable review, but only with a police accident report.

The Risk Window

When is wildlife most likely to be near the road?

Wildlife is most likely near the road around dawn and dusk and into the night, and most of all in the fall. FHWA's wildlife-vehicle collision study for Congress found that collisions with large animals peak from 5 to 8 a.m. and from 4 p.m. to midnight, in October and November, and to a lesser degree in May and June.

The reasons are seasonal. Deer move most at dawn and dusk, when traffic is also heavy, and fall brings mating, migration, and hunting season. Spring brings young animals and migration. Missouri's DOT, for one, puts most of its deer strikes in October and November, with the breeding season peaking in mid-November.

Where and when wildlife collisions concentrate, from FHWA's 2008 report to Congress.
FactorWhat the data show
Time of day5 to 8 a.m., and 4 p.m. to midnight
SeasonOctober and November, with a smaller peak in May and June
Road89% on two-lane roads
AnimalMostly deer: as high as 90% of reported cases in some states
Vehicles involvedMore than 98% are single-vehicle crashes

The problem is bigger than police data suggest. FHWA estimated 1 to 2 million collisions with large animals a year, against about 300,000 reported, with roughly 26,000 injuries and 200 deaths. Most cause no human injury, but more than 90% of deer collisions damage the vehicle.

Before the Strike

How do you spot wildlife in time from a truck?

Look far ahead, drive slowly enough to stop within what your headlights show, and treat one animal as a sign of more. The commercial driver's license manual drivers study for the test gives the numbers; we used the Texas edition.

  • Scan 12 to 15 seconds ahead. At highway speed that is about a quarter mile. Shift your attention between far and near, and scan both sides of the road.
  • Don't out-drive your headlights. Low beams light about 250 feet ahead and high beams about 350 to 500 feet. At 55 mph a truck needs at least 419 feet to stop in ideal conditions, so at night your speed decides whether you can stop for what you see.
  • Use high beams when you can. The manual says to use them when it is safe and legal, and not within 500 feet of an approaching vehicle. Keep the cab lights low so you can see out.
  • Watch for eye shine, and for the second deer. Missouri DOT advises watching for the reflection of deer eyes in your headlights and staying on guard after you see one, because there are likely more.
  • Plan for the season. On rural two-lane routes in October and November, build slower dawn and dusk running into the schedule, so nobody is making up time in the dark.

For the rest of night driving, from glare to drowsiness, see our guide to driving a truck safely at night.

The Moment

Should a truck driver swerve to avoid an animal?

Usually not. If an animal is in your path and you can't stop in time, brake firmly and stay in your lane. Missouri DOT tells drivers never to swerve to avoid animals, because it can cause a loss of control.

The CDL manual explains why the stakes are higher in a truck. It teaches that you can often steer around an obstacle faster than you can stop, but warns that top-heavy vehicles and tractors with multiple trailers may flip over, and that the more sharply you turn, the greater the chance of a skid or rollover. A deer is rarely worth that trade, least of all with oncoming traffic or a ditch beside you.

If you must steer, the manual's rules apply: both hands on the wheel, no braking during the turn, turn no more than you need to clear the hazard, and be ready to counter-steer.

An honest caveat. No rule fits every animal and every road. A clear shoulder, an empty lane, and an empty truck give a driver options that a loaded tractor-trailer on a narrow two-lane road does not. Training is what lets a driver make that call in a second.
After Impact

What should you do right after a wildlife collision?

Protect the scene, check on people, inspect the truck before it moves again, and document everything. Our guide to what to do after a truck accident covers crashes with other vehicles; these steps are what an animal strike adds.

Step 1: Stop safely and warn traffic

If you stop on the road or shoulder, turn on the hazard flashers immediately and place your warning devices within 10 minutes, under 49 CFR 392.22: one about 10 feet behind the truck on the traffic side, one 100 feet behind, and one 100 feet ahead. On a divided highway, all three go behind the truck, at about 10, 100, and 200 feet. Within 500 feet of a curve or hilltop, place the device on that side 100 to 500 feet out.

Step 2: Check on people, then call it in

Call police if anyone is hurt, another vehicle is involved, or the truck can't be driven away, and follow your state's crash-reporting law. A police accident report is also what a later preventability review requires. Stay away from an injured animal, and don't try to drag a carcass out of a traffic lane: Missouri DOT tells drivers to call the highway agency instead.

Step 3: Inspect before the truck moves

Animal strikes usually hit the front end: headlights, bumper, grille, radiator, and the hoses and lines behind them. A vehicle likely to cause a crash or breakdown can't be operated under 49 CFR 396.7, and required lamps must work (49 CFR 393.9). With damage, the truck may go only to the nearest place it can be safely repaired, and only if that is less hazardous than leaving it on the highway.

Step 4: Document it and report it

Photograph the truck, the scene, and the road from your approach, and save any dash camera video. Tell dispatch, and list the damage on your driver vehicle inspection report; the carrier must repair it, or certify that repair is unnecessary, before the truck runs again (49 CFR 396.11).

Mechanic inspecting a semi-tractor's cracked bumper, broken headlight, and dented grille in a repair shop bay
The damage behind the grille, not the dent in front, decides whether the truck can safely run again.
Your Record

Does hitting a deer count against your safety record?

Only if it meets FMCSA's definition of an accident. Under 49 CFR 390.5T, that means a fatality, an injury treated immediately away from the scene, or a vehicle towed away with disabling damage. A deer strike you drive away from is not one.

One that is goes in your accident register for 3 years (49 CFR 390.15) and, once the state reports it, into FMCSA's Safety Measurement System. Per FMCSA's SMS methodology, the Crash Indicator BASIC weighs a tow-away-only crash at 1 and an injury or fatal crash at 2, for 24 months.

Is a post-accident drug and alcohol test required?

After a fatal crash, always. After an injury or tow-away crash, only if the driver receives a citation for a moving violation arising from it, within 8 hours for the alcohol test or 32 hours for the drug test (49 CFR 382.303). The animal doesn't change the rule; the citation does.

Can an animal strike be found not preventable?

Yes. "CMV struck an animal" is one of 21 crash types in FMCSA's Crash Preventability Determination Program for crashes on or after December 1, 2024. You file a Request for Data Review in DataQs with the police accident report; requests without one are closed. The crash must already be in FMCSA's records from the state, and FMCSA can't review crashes older than 5 years.

The burden is on you to show the crash was not preventable, so add photos and video. If FMCSA agrees, the crash stays listed as "Reviewed – Not Preventable" but drops out of your Crash Indicator, and the finding is noted on the driver's Pre-Employment Screening Program record. FMCSA can also find a crash Preventable or Undecided. Our loss-prevention routine shows where this request fits after any crash.

The Damage

Who pays for damage to the truck after hitting an animal?

Your own physical damage coverage, if you carry it and it covers the cause. Auto liability pays for harm you cause to others; it does not repair your truck.

Which part of the policy responds decides your deductible. The NAIC's consumer guidance says that on an auto policy, damage from hitting an animal falls under comprehensive coverage, not collision, and that with only collision or liability the insurer won't pay for it. Trucking physical damage is written in different ways, so ask where an animal strike lands on your policy, and what deductible applies, before the fall peak.

A recordable crash also follows you into renewal as part of your loss and safety history, which is one more reason to file the preventability request. See how CSA scores affect truck insurance.

How Simplex Helps

How Simplex helps you manage wildlife risk

Trained drivers, a crash record you keep current, and coverage that fits your trucks. We help with each.

01

Driver performance and training

Through our CSA program, our team monitors your drivers' performance and designs the policies and training your operation needs.

02

A compliance program that keeps checking

Our compliance programs include CSA monitoring, driver qualification file management, and a DOT mock audit.

03

Coverage for your own equipment

Physical damage insurance pays to repair or replace your trucks and trailers after a covered loss.

Talk to Our Team
Your Questions, Answered

Frequently asked questions

When is wildlife most likely to be near the road?+
Around dawn and dusk and into the night. FHWA found collisions with large animals peak from 5 to 8 a.m. and from 4 p.m. to midnight, and in October and November, with a smaller peak in May and June.
How far ahead should you scan where wildlife is common?+
At least 12 to 15 seconds ahead, which the CDL manual puts at about a quarter mile at highway speed. Scan both sides of the road, and drive slowly enough to stop within your headlights.
Should you swerve to avoid hitting a deer?+
No. Brake firmly and stay in your lane. A sharp swerve can skid or roll a truck, especially a top-heavy one or a combination with multiple trailers, and can put you into oncoming traffic.
Is hitting a deer a DOT recordable accident?+
Only if someone dies, someone is injured and treated immediately away from the scene, or a vehicle is towed away with disabling damage. A strike you drive away from doesn't meet the definition in 49 CFR 390.5T.
Can a deer strike be removed from my CSA score?+
It can come out of the Crash Indicator calculation if FMCSA finds it not preventable. Animal strikes are an eligible crash type: file a request in DataQs with the police accident report.
Sources & Author

Where this information comes from

The data and rules below come from FHWA, the CDL manual, federal regulation, FMCSA, and Missouri DOT, checked on October 19, 2026.

Rigo Diaz, Founder & CEO of Simplex Group

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

Before the Fall Peak

Most of a wildlife strike is decided before and after the impact

Speed in the dark and the choice not to swerve decide how bad it is. A police report, an inspection report, and a DataQs request decide what it costs your record.

If you want help training drivers for wildlife season or reviewing a crash on your record, talk to our team.

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