State Highway 171 in Illinois: fatal crashes
From 2015 to 2024, 47 fatal crashes on State Highway 171 in Illinois killed 52 people. In 2024 there were 1 fatal crashes and 1 deaths on the road.
An state highway running through 2 counties of Illinois. All fatal crashes in Illinois.
Deaths on State Highway 171 in Illinois by year
| Year | Fatal crashes | Deaths |
|---|---|---|
| 2024 | 1 | 1 |
| 2023 | 5 | 5 |
| 2022 | 11 | 12 |
| 2021 | 2 | 2 |
| 2020 | 3 | 3 |
| 2019 | 6 | 6 |
| 2018 | 4 | 5 |
| 2017 | 3 | 5 |
| 2016 | 4 | 5 |
| 2015 | 8 | 8 |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
Where on State Highway 171 in Illinois: the counties with the most fatal crashes
Cook County County had the most fatal crashes on State Highway 171 from 2015 to 2024: 34, with 37 deaths. Counties are listed from 5 fatal crashes.
| County | 2024 | 2015 to 2024 | Deaths | |
|---|---|---|---|---|
| 1 | Cook County | 0 | 34 | 37 |
| 2 | Will County | 1 | 13 | 15 |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
When fatal crashes happen on State Highway 171 in Illinois
Too few crashes to name a heaviest slot. The grid shows the shares; a share is only given over 20 crashes.
| Midnight to 4 | 4 to 8 am | 8 to noon | Noon to 4 | 4 to 8 pm | 8 to midnight | |
|---|---|---|---|---|---|---|
| Sun | 2.1 percent, 1 fatal crashes | 2.1 percent, 1 fatal crashes | 10.6 percent, 5 fatal crashes | 2.1 percent, 1 fatal crashes | 4.3 percent, 2 fatal crashes | 2.1 percent, 1 fatal crashes |
| Mon | 0.0 percent, 0 fatal crashes | 2.1 percent, 1 fatal crashes | 0.0 percent, 0 fatal crashes | 0.0 percent, 0 fatal crashes | 8.5 percent, 4 fatal crashes | 4.3 percent, 2 fatal crashes |
| Tue | 0.0 percent, 0 fatal crashes | 2.1 percent, 1 fatal crashes | 2.1 percent, 1 fatal crashes | 0.0 percent, 0 fatal crashes | 0.0 percent, 0 fatal crashes | 2.1 percent, 1 fatal crashes |
| Wed | 0.0 percent, 0 fatal crashes | 2.1 percent, 1 fatal crashes | 2.1 percent, 1 fatal crashes | 0.0 percent, 0 fatal crashes | 2.1 percent, 1 fatal crashes | 2.1 percent, 1 fatal crashes |
| Thu | 0.0 percent, 0 fatal crashes | 2.1 percent, 1 fatal crashes | 0.0 percent, 0 fatal crashes | 0.0 percent, 0 fatal crashes | 0.0 percent, 0 fatal crashes | 2.1 percent, 1 fatal crashes |
| Fri | 0.0 percent, 0 fatal crashes | 2.1 percent, 1 fatal crashes | 2.1 percent, 1 fatal crashes | 2.1 percent, 1 fatal crashes | 0.0 percent, 0 fatal crashes | 2.1 percent, 1 fatal crashes |
| Sat | 8.5 percent, 4 fatal crashes | 2.1 percent, 1 fatal crashes | 0.0 percent, 0 fatal crashes | 4.3 percent, 2 fatal crashes | 10.6 percent, 5 fatal crashes | 8.5 percent, 4 fatal crashes |
By hour
By month
- Jan8.5%
- Feb0.0%
- Mar6.4%
- Apr12.8%
- May6.4%
- Jun6.4%
- Jul4.3%
- Aug10.6%
- Sep14.9%
- Oct10.6%
- Nov2.1%
- Dec17.0%
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
What fatal crashes on State Highway 171 in Illinois first hit
The first harmful event was a collision with another vehicle in most fatal crashes, 60%; a fixed object such as a tree, pole or barrier in 21%, a pedestrian in 8.5%, a cyclist in 4.3%.
| First harmful event | Fatal crashes | Share |
|---|---|---|
| Collision with another vehicle | 28 | 60% |
| Fixed object (tree, pole, barrier, ditch) | 10 | 21% |
| Pedestrian | 4 | 8.5% |
| Cyclist | 2 | 4.3% |
| Rollover | 2 | 4.3% |
| Other | 1 | 2.1% |
| Parked vehicle | 0 | 0.0% |
| Not reported | 0 | 0.0% |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
How fatal crashes on State Highway 171 in Illinois compare with the state
A drinking driver was recorded in 19% of fatal crashes in State Highway 171 in Illinois from 2015 to 2024, below the Illinois share of 27%; speeding in 30%, below the Illinois share of 37%; a hit-and-run in 13%, above the Illinois share of 8.4%; 34% of passenger-vehicle occupants killed with belt use known were unbelted, below the Illinois share of 46%. Shares of fatal crashes from 2015 to 2024, against the share across all of Illinois. A share is only given over 20 crashes.
| State Highway 171 | Illinois | ||
|---|---|---|---|
| On rural stretches | 2.1% | 34% | below the Illinois share |
| At or near an intersection | 40% | 30% | above the Illinois share |
| In the dark, road unlit | 40% | 25% | above the Illinois share |
| A drinking driver | 19% | 27% | below the Illinois share |
| Speeding | 30% | 37% | below the Illinois share |
| Occupants killed unbelted | 34% | 46% | below the Illinois share |
| Hit-and-run | 13% | 8.4% | above the Illinois share |
| A motorcycle involved | 15% | 14% | about the same as the Illinois share |
| Pedestrians among the dead | 7.7% | 16% | below the Illinois share |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
Questions about fatal crashes in State Highway 171 in Illinois
- How many fatal crashes have there been on State Highway 171 in Illinois?
- 47 fatal crashes killed 52 people on State Highway 171 in Illinois from 2015 to 2024. In 2024 there were 1 fatal crashes and 1 deaths.
- Where on State Highway 171 in Illinois do the most fatal crashes happen?
- Cook County had the most fatal crashes on State Highway 171 from 2015 to 2024: 34, with 37 deaths. Will County was second with 13.
Other roads in Illinois with a page
All fatal crashes in Illinois, with every road ranked.
Where the State Highway 171 numbers come from
Counted from NHTSA's Fatality Analysis Reporting System, 2024 Annual Report File: every fatal crash whose road NHTSA filed as State Highway 171 in Illinois (filed under 20 spellings, such as "SR- 171", "SR-171", "SR-171 (1ST AVE)", "SR-171 (ARCHER AVE)"). Ramps, frontage and service roads are left out. A fatal crash is one in which someone died within 30 days. The full method.